[INFO] cloning repository https://github.com/WanderLanz/Lender
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/WanderLanz/Lender" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWanderLanz%2FLender", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWanderLanz%2FLender'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cc3bb8911b029e1c727ee3ba15325ebb333427b8
[INFO] checking WanderLanz/Lender against try#a3dffdb3a32d0dedc198f9de7d43173f3eb6727b for pr-136303
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWanderLanz%2FLender" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/WanderLanz/Lender on toolchain a3dffdb3a32d0dedc198f9de7d43173f3eb6727b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/WanderLanz/Lender
[INFO] finished tweaking git repo https://github.com/WanderLanz/Lender
[INFO] tweaked toml for git repo https://github.com/WanderLanz/Lender written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 5 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 76f7fdcc828700db6e06c2addbe3993e985ac1342acd8dcf220853c2afd4e36e
[INFO] running `Command { std: "docker" "start" "-a" "76f7fdcc828700db6e06c2addbe3993e985ac1342acd8dcf220853c2afd4e36e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76f7fdcc828700db6e06c2addbe3993e985ac1342acd8dcf220853c2afd4e36e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76f7fdcc828700db6e06c2addbe3993e985ac1342acd8dcf220853c2afd4e36e", kill_on_drop: false }`
[INFO] [stdout] 76f7fdcc828700db6e06c2addbe3993e985ac1342acd8dcf220853c2afd4e36e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52dd7a8b8cbd7f11bebbe7d75c4aab60763a5c3f1585e91553d95d97b865183c
[INFO] running `Command { std: "docker" "start" "-a" "52dd7a8b8cbd7f11bebbe7d75c4aab60763a5c3f1585e91553d95d97b865183c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling unicode-ident v1.0.16
[INFO] [stderr]     Checking stable_try_trait_v2 v1.75.1 (/opt/rustwide/workdir/stable_try_trait_v2)
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]     Checking syn v2.0.96
[INFO] [stderr]     Checking lender-derive v0.1.2 (/opt/rustwide/workdir/lender-derive)
[INFO] [stderr]    Compiling lender-derive v0.1.2
[INFO] [stderr]     Checking lender v0.2.9 (/opt/rustwide/workdir/lender)
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:29:23
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl<L, F> Lender for FilterMap<L, F>
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required by a bound in `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Lender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:49:34
[INFO] [stdout]    |
[INFO] [stdout] 49 | impl<L, F> DoubleEndedLender for FilterMap<L, F>
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:11
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] note: required by a bound in `double_ended::DoubleEndedLender`
[INFO] [stdout]   --> lender/src/traits/double_ended.rs:9:30
[INFO] [stdout]    |
[INFO] [stdout] 9  | pub trait DoubleEndedLender: Lender {
[INFO] [stdout]    |                              ^^^^^^ required by this bound in `DoubleEndedLender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:64:28
[INFO] [stdout]    |
[INFO] [stdout] 64 | impl<L, F> FusedLender for FilterMap<L, F>
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:11
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] note: required by a bound in `traits::marker::FusedLender`
[INFO] [stdout]   --> lender/src/traits/marker.rs:4:24
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub trait FusedLender: Lender {}
[INFO] [stdout]    |                        ^^^^^^ required by this bound in `FusedLender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:34:27
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:54:32
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:29:23
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl<L, F> Lender for FilterMap<L, F>
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required by a bound in `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Lender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:49:34
[INFO] [stdout]    |
[INFO] [stdout] 49 | impl<L, F> DoubleEndedLender for FilterMap<L, F>
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:11
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] note: required by a bound in `double_ended::DoubleEndedLender`
[INFO] [stdout]   --> lender/src/traits/double_ended.rs:9:30
[INFO] [stdout]    |
[INFO] [stdout] 9  | pub trait DoubleEndedLender: Lender {
[INFO] [stdout]    |                              ^^^^^^ required by this bound in `DoubleEndedLender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:64:28
[INFO] [stdout]    |
[INFO] [stdout] 64 | impl<L, F> FusedLender for FilterMap<L, F>
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:11
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] note: required by a bound in `traits::marker::FusedLender`
[INFO] [stdout]   --> lender/src/traits/marker.rs:4:24
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub trait FusedLender: Lender {}
[INFO] [stdout]    |                        ^^^^^^ required by this bound in `FusedLender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:34:27
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:54:32
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `<F as FnMutHKA<'lend, <L as Lending<'lend>>::Lend>>::B`, but it returns `<F as FnOnce<(<L as Lending<'lend>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     type Lend = <F as FnMutHKA<'lend, Lend<'lend, L>>>::B;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnMutHKA<'lend, <L as lender::Lending<'lend>>::Lend>>::B`
[INFO] [stdout]               found associated type `<F as FnOnce<(<L as lender::Lending<'lend>>::Lend,)>>::Output`
[INFO] [stdout]    = note: an associated type was expected, but a different one was found
[INFO] [stdout] note: required by a bound in `FnMutHKA`
[INFO] [stdout]   --> lender/src/higher_order.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub trait FnMutHKA<'b, A>: FnMut(A) -> <Self as FnMutHKA<'b, A>>::B {
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKA`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `<F as FnMutHKA<'_, <L as Lending<'_>>::Lend>>::B`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map.rs:33:27
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B`
[INFO] [stdout]               found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = note: an associated type was expected, but a different one was found
[INFO] [stdout] note: required by a bound in `FnMutHKA`
[INFO] [stdout]   --> lender/src/higher_order.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub trait FnMutHKA<'b, A>: FnMut(A) -> <Self as FnMutHKA<'b, A>>::B {
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKA`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `<F as FnMutHKA<'_, <L as Lending<'_>>::Lend>>::B`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map.rs:46:32
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B`
[INFO] [stdout]               found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = note: an associated type was expected, but a different one was found
[INFO] [stdout] note: required by a bound in `FnMutHKA`
[INFO] [stdout]   --> lender/src/higher_order.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub trait FnMutHKA<'b, A>: FnMut(A) -> <Self as FnMutHKA<'b, A>>::B {
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKA`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `P` to be a type parameter that returns `Option<_>`, but it returns `<P as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:28:23
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl<L, P> Lender for MapWhile<L, P>
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `map_while::MapWhile<L, P>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, P> Lending<'lend> for MapWhile<L, P>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     P: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required by a bound in `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Lender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `P` to be a type parameter that returns `Option<_>`, but it returns `<P as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `map_while::MapWhile<L, P>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, P> Lending<'lend> for MapWhile<L, P>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     P: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `P` to be a type parameter that returns `Option<_>`, but it returns `<P as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:34:27
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `map_while::MapWhile<L, P>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, P> Lending<'lend> for MapWhile<L, P>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     P: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `<F as FnMutHKA<'lend, <L as Lending<'lend>>::Lend>>::B`, but it returns `<F as FnOnce<(<L as Lending<'lend>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     type Lend = <F as FnMutHKA<'lend, Lend<'lend, L>>>::B;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnMutHKA<'lend, <L as lender::Lending<'lend>>::Lend>>::B`
[INFO] [stdout]               found associated type `<F as FnOnce<(<L as lender::Lending<'lend>>::Lend,)>>::Output`
[INFO] [stdout]    = note: an associated type was expected, but a different one was found
[INFO] [stdout] note: required by a bound in `FnMutHKA`
[INFO] [stdout]   --> lender/src/higher_order.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub trait FnMutHKA<'b, A>: FnMut(A) -> <Self as FnMutHKA<'b, A>>::B {
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKA`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `<F as FnMutHKA<'_, <L as Lending<'_>>::Lend>>::B`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map.rs:33:27
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B`
[INFO] [stdout]               found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = note: an associated type was expected, but a different one was found
[INFO] [stdout] note: required by a bound in `FnMutHKA`
[INFO] [stdout]   --> lender/src/higher_order.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub trait FnMutHKA<'b, A>: FnMut(A) -> <Self as FnMutHKA<'b, A>>::B {
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKA`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `<F as FnMutHKA<'_, <L as Lending<'_>>::Lend>>::B`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map.rs:46:32
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B`
[INFO] [stdout]               found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = note: an associated type was expected, but a different one was found
[INFO] [stdout] note: required by a bound in `FnMutHKA`
[INFO] [stdout]   --> lender/src/higher_order.rs:22:40
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub trait FnMutHKA<'b, A>: FnMut(A) -> <Self as FnMutHKA<'b, A>>::B {
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKA`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `P` to be a type parameter that returns `Option<_>`, but it returns `<P as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:28:23
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl<L, P> Lender for MapWhile<L, P>
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `map_while::MapWhile<L, P>` to implement `for<'all> lender::Lending<'all>`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, P> Lending<'lend> for MapWhile<L, P>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     P: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] note: required by a bound in `lender::Lender`
[INFO] [stdout]   --> lender/src/traits/lender.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub trait Lender: for<'all /* where Self: 'all */> Lending<'all> {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Lender`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `P` to be a type parameter that returns `Option<_>`, but it returns `<P as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `map_while::MapWhile<L, P>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, P> Lending<'lend> for MapWhile<L, P>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     P: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `P` to be a type parameter that returns `Option<_>`, but it returns `<P as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:34:27
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `map_while::MapWhile<L, P>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, P> Lending<'lend> for MapWhile<L, P>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     P: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:785:51
[INFO] [stdout]     |
[INFO] [stdout] 785 |     fn find_map<'a, F>(&'a mut self, mut f: F) -> Option<<F as FnMutHKAOpt<'a, Lend<'a, Self>>>::B>
[INFO] [stdout]     |                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:785:51
[INFO] [stdout]     |
[INFO] [stdout] 785 |     fn find_map<'a, F>(&'a mut self, mut f: F) -> Option<<F as FnMutHKAOpt<'a, Lend<'a, Self>>>::B>
[INFO] [stdout]     |                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:36:20
[INFO] [stdout]    |
[INFO] [stdout] 36 |             if let Some(y) = (self.f)(x) {
[INFO] [stdout]    |                    ^^^^^^^   ----------- this expression has type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    expected associated type, found `Option<_>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]                          found enum `Option<_>`
[INFO] [stdout] help: a method is available that returns `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> /rustc/a3dffdb3a32d0dedc198f9de7d43173f3eb6727b/library/core/src/ops/function.rs:250:5
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider calling `call_once`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:38:61
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:38:77
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 |             if let Some(y) = (self.f)(x) {
[INFO] [stdout]    |                    ^^^^^^^   ----------- this expression has type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    expected associated type, found `Option<_>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]                          found enum `Option<_>`
[INFO] [stdout] help: a method is available that returns `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> /rustc/a3dffdb3a32d0dedc198f9de7d43173f3eb6727b/library/core/src/ops/function.rs:250:5
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider calling `call_once`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:58:61
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:58:77
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:36:20
[INFO] [stdout]    |
[INFO] [stdout] 36 |             if let Some(y) = (self.f)(x) {
[INFO] [stdout]    |                    ^^^^^^^   ----------- this expression has type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    expected associated type, found `Option<_>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]                          found enum `Option<_>`
[INFO] [stdout] help: a method is available that returns `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> /rustc/a3dffdb3a32d0dedc198f9de7d43173f3eb6727b/library/core/src/ops/function.rs:250:5
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider calling `call_once`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:38:61
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:38:77
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 |             if let Some(y) = (self.f)(x) {
[INFO] [stdout]    |                    ^^^^^^^   ----------- this expression has type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    expected associated type, found `Option<_>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]                          found enum `Option<_>`
[INFO] [stdout] help: a method is available that returns `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> /rustc/a3dffdb3a32d0dedc198f9de7d43173f3eb6727b/library/core/src/ops/function.rs:250:5
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider calling `call_once`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:58:61
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<_>`, but it returns `<F as FnOnce<(<L as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:58:77
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 return Some(unsafe { core::mem::transmute::<Lend<'_, Self>, Lend<'_, Self>>(y) });
[INFO] [stdout]    |                                                                             ^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required for `filter_map::FilterMap<L, F>` to implement `lender::Lending<'_>`
[INFO] [stdout]   --> lender/src/adapters/filter_map.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<'lend, B, L, F> Lending<'lend> for FilterMap<L, F>
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^
[INFO] [stdout] 21 | where
[INFO] [stdout] 22 |     F: FnMut(Lend<'lend, L>) -> Option<B>,
[INFO] [stdout]    |                                 --------- unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/map.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ---------------------- expected `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>` because of return type
[INFO] [stdout] 34 |         self.lender.next().map(&mut self.f)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected enum `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]               found enum `Option<<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/map.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                                ---------------------- expected `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>` because of return type
[INFO] [stdout] 47 |         self.lender.next_back().map(&mut self.f)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected enum `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]               found enum `Option<<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ---------------------- expected `Option<_>` because of return type
[INFO] [stdout] 35 |         (self.predicate)(self.lender.next()?)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] help: try wrapping the expression in `core::prelude::v1::Some`
[INFO] [stdout]    |
[INFO] [stdout] 35 |         core::prelude::v1::Some((self.predicate)(self.lender.next()?))
[INFO] [stdout]    |         ++++++++++++++++++++++++                                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/map.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ---------------------- expected `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>` because of return type
[INFO] [stdout] 34 |         self.lender.next().map(&mut self.f)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected enum `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]               found enum `Option<<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/map.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn next_back(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                                ---------------------- expected `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>` because of return type
[INFO] [stdout] 47 |         self.lender.next_back().map(&mut self.f)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `FnMutHKA::B`, found `core::ops::FnOnce::Output`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected enum `Option<<F as FnMutHKA<'_, <L as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]               found enum `Option<<F as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> lender/src/adapters/map_while.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn next(&mut self) -> Option<Lend<'_, Self>> {
[INFO] [stdout]    |                           ---------------------- expected `Option<_>` because of return type
[INFO] [stdout] 35 |         (self.predicate)(self.lender.next()?)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Option<_>`, found associated type
[INFO] [stdout]    |
[INFO] [stdout]    = note:         expected enum `Option<_>`
[INFO] [stdout]            found associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    = help: consider constraining the associated type `<P as FnOnce<(<L as lender::Lending<'_>>::Lend,)>>::Output` to `Option<_>`
[INFO] [stdout]    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] help: try wrapping the expression in `core::prelude::v1::Some`
[INFO] [stdout]    |
[INFO] [stdout] 35 |         core::prelude::v1::Some((self.predicate)(self.lender.next()?))
[INFO] [stdout]    |         ++++++++++++++++++++++++                                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> lender/src/traits/lender.rs:791:20
[INFO] [stdout]     |
[INFO] [stdout] 791 |             if let Some(y) = f(x) {
[INFO] [stdout]     |                    ^^^^^^^   ---- this expression has type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    expected associated type, found `Option<_>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected associated type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]                           found enum `Option<_>`
[INFO] [stdout] help: a method is available that returns `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    --> /rustc/a3dffdb3a32d0dedc198f9de7d43173f3eb6727b/library/core/src/ops/function.rs:250:5
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider calling `call_once`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'_, <Self as Lending<'_>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:795:47
[INFO] [stdout]     |
[INFO] [stdout] 795 |                         <F as FnMutHKAOpt<'_, Lend<'_, Self>>>::B,
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'_, <Self as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'_, <Self as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt::B`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt::B`
[INFO] [stdout] 31  |     type B: 'b;
[INFO] [stdout]     |          - required by a bound in this associated type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:796:47
[INFO] [stdout]     |
[INFO] [stdout] 796 |                         <F as FnMutHKAOpt<'a, Lend<'a, Self>>>::B
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt::B`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt::B`
[INFO] [stdout] 31  |     type B: 'b;
[INFO] [stdout]     |          - required by a bound in this associated type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:793:24
[INFO] [stdout]     |
[INFO] [stdout] 793 |                 return Some(unsafe {
[INFO] [stdout]     |                        ^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:793:24
[INFO] [stdout]     |
[INFO] [stdout] 793 |                   return Some(unsafe {
[INFO] [stdout]     |  ________________________^
[INFO] [stdout] 794 | |                     core::mem::transmute::<
[INFO] [stdout] 795 | |                         <F as FnMutHKAOpt<'_, Lend<'_, Self>>>::B,
[INFO] [stdout] 796 | |                         <F as FnMutHKAOpt<'a, Lend<'a, Self>>>::B
[INFO] [stdout] 797 | |                     >(y)
[INFO] [stdout] 798 | |                 });
[INFO] [stdout]     | |__________________^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:801:9
[INFO] [stdout]     |
[INFO] [stdout] 801 |         None
[INFO] [stdout]     |         ^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> lender/src/traits/lender.rs:791:20
[INFO] [stdout]     |
[INFO] [stdout] 791 |             if let Some(y) = f(x) {
[INFO] [stdout]     |                    ^^^^^^^   ---- this expression has type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    expected associated type, found `Option<_>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected associated type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]                           found enum `Option<_>`
[INFO] [stdout] help: a method is available that returns `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    --> /rustc/a3dffdb3a32d0dedc198f9de7d43173f3eb6727b/library/core/src/ops/function.rs:250:5
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider calling `call_once`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'_, <Self as Lending<'_>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:795:47
[INFO] [stdout]     |
[INFO] [stdout] 795 |                         <F as FnMutHKAOpt<'_, Lend<'_, Self>>>::B,
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'_, <Self as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'_>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'_, <Self as lender::Lending<'_>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt::B`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt::B`
[INFO] [stdout] 31  |     type B: 'b;
[INFO] [stdout]     |          - required by a bound in this associated type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:796:47
[INFO] [stdout]     |
[INFO] [stdout] 796 |                         <F as FnMutHKAOpt<'a, Lend<'a, Self>>>::B
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt::B`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt::B`
[INFO] [stdout] 31  |     type B: 'b;
[INFO] [stdout]     |          - required by a bound in this associated type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:793:24
[INFO] [stdout]     |
[INFO] [stdout] 793 |                 return Some(unsafe {
[INFO] [stdout]     |                        ^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:793:24
[INFO] [stdout]     |
[INFO] [stdout] 793 |                   return Some(unsafe {
[INFO] [stdout]     |  ________________________^
[INFO] [stdout] 794 | |                     core::mem::transmute::<
[INFO] [stdout] 795 | |                         <F as FnMutHKAOpt<'_, Lend<'_, Self>>>::B,
[INFO] [stdout] 796 | |                         <F as FnMutHKAOpt<'a, Lend<'a, Self>>>::B
[INFO] [stdout] 797 | |                     >(y)
[INFO] [stdout] 798 | |                 });
[INFO] [stdout]     | |__________________^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: expected `F` to be a type parameter that returns `Option<<F as FnMutHKAOpt<'a, <Self as Lending<'a>>::Lend>>::B>`, but it returns `<F as FnOnce<(<Self as Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]    --> lender/src/traits/lender.rs:801:9
[INFO] [stdout]     |
[INFO] [stdout] 801 |         None
[INFO] [stdout]     |         ^^^^ expected `Option<<... as FnMutHKAOpt<'_, ...>>::B>`, found associated type
[INFO] [stdout]     |
[INFO] [stdout]     = note:         expected enum `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]             found associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output`
[INFO] [stdout]     = help: consider constraining the associated type `<F as FnOnce<(<Self as lender::Lending<'a>>::Lend,)>>::Output` to `Option<<F as FnMutHKAOpt<'a, <Self as lender::Lending<'a>>::Lend>>::B>`
[INFO] [stdout]     = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
[INFO] [stdout] note: required by a bound in `FnMutHKAOpt`
[INFO] [stdout]    --> lender/src/higher_order.rs:30:43
[INFO] [stdout]     |
[INFO] [stdout] 30  | pub trait FnMutHKAOpt<'b, A>: FnMut(A) -> Option<<Self as FnMutHKAOpt<'b, A>>::B> {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `FnMutHKAOpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0271, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0271`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lender` (lib) due to 29 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] Some errors have detailed explanations: E0271, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0271`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lender` (lib test) due to 29 previous errors
[INFO] running `Command { std: "docker" "inspect" "52dd7a8b8cbd7f11bebbe7d75c4aab60763a5c3f1585e91553d95d97b865183c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52dd7a8b8cbd7f11bebbe7d75c4aab60763a5c3f1585e91553d95d97b865183c", kill_on_drop: false }`
[INFO] [stdout] 52dd7a8b8cbd7f11bebbe7d75c4aab60763a5c3f1585e91553d95d97b865183c