[INFO] fetching crate hamst 0.1.0...
[INFO] testing hamst-0.1.0 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate hamst 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate hamst 0.1.0
[INFO] finished tweaking crates.io crate hamst 0.1.0
[INFO] tweaked toml for crates.io crate hamst 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate hamst 0.1.0 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 25 packages to latest compatible versions
[INFO] [stderr]       Adding quickcheck v0.9.2 (available: v1.0.3)
[INFO] [stderr]       Adding quickcheck_macros v0.9.1 (available: v1.1.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded quickcheck_macros v0.9.1
[INFO] [stderr]   Downloaded quickcheck v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 10ec7455e5153a00afadc22e955d82e608a446cf2ccffc618743eaf1b84dbb6e
[INFO] running `Command { std: "docker" "start" "-a" "10ec7455e5153a00afadc22e955d82e608a446cf2ccffc618743eaf1b84dbb6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10ec7455e5153a00afadc22e955d82e608a446cf2ccffc618743eaf1b84dbb6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10ec7455e5153a00afadc22e955d82e608a446cf2ccffc618743eaf1b84dbb6e", kill_on_drop: false }`
[INFO] [stdout] 10ec7455e5153a00afadc22e955d82e608a446cf2ccffc618743eaf1b84dbb6e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 299973a0b4b0743dde77acc29b4969e78e101d4192bf9e7704937ff70e9b72ee
[INFO] running `Command { std: "docker" "start" "-a" "299973a0b4b0743dde77acc29b4969e78e101d4192bf9e7704937ff70e9b72ee", kill_on_drop: false }`
[INFO] [stderr]    Compiling hamst v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `InsertError`, `RemoveError`, `ReplaceError`, and `UpdateError`
[INFO] [stdout]  --> src/immutable.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub use super::mutable::{InsertError, RemoveError, ReplaceError, UpdateError};
[INFO] [stdout]   |                          ^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/immutable.rs:122:17
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn iter(&self) -> HamtIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn iter(&self) -> HamtIter<'_, K, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/node.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn iter(&self) -> NodeIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn iter(&self) -> NodeIter<'_, K, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "299973a0b4b0743dde77acc29b4969e78e101d4192bf9e7704937ff70e9b72ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "299973a0b4b0743dde77acc29b4969e78e101d4192bf9e7704937ff70e9b72ee", kill_on_drop: false }`
[INFO] [stdout] 299973a0b4b0743dde77acc29b4969e78e101d4192bf9e7704937ff70e9b72ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e684dce90388b92d27817438473707571a762f73651c6117ef549cecc26b3f0
[INFO] running `Command { std: "docker" "start" "-a" "1e684dce90388b92d27817438473707571a762f73651c6117ef549cecc26b3f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex-syntax v0.8.8
[INFO] [stdout] warning: unused imports: `InsertError`, `RemoveError`, `ReplaceError`, and `UpdateError`
[INFO] [stdout]  --> src/immutable.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub use super::mutable::{InsertError, RemoveError, ReplaceError, UpdateError};
[INFO] [stdout]   |                          ^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/immutable.rs:122:17
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn iter(&self) -> HamtIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn iter(&self) -> HamtIter<'_, K, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/node.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn iter(&self) -> NodeIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn iter(&self) -> NodeIter<'_, K, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling aho-corasick v1.1.4
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling quickcheck_macros v0.9.1
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling regex-automata v0.4.13
[INFO] [stderr]    Compiling regex v1.12.2
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling quickcheck v0.9.2
[INFO] [stderr]    Compiling hamst v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `InsertError`, `RemoveError`, `ReplaceError`, and `UpdateError`
[INFO] [stdout]  --> src/immutable.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub use super::mutable::{InsertError, RemoveError, ReplaceError, UpdateError};
[INFO] [stdout]   |                          ^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/immutable.rs:122:17
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn iter(&self) -> HamtIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn iter(&self) -> HamtIter<'_, K, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/node.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn iter(&self) -> NodeIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn iter(&self) -> NodeIter<'_, K, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 11.13s
[INFO] running `Command { std: "docker" "inspect" "1e684dce90388b92d27817438473707571a762f73651c6117ef549cecc26b3f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e684dce90388b92d27817438473707571a762f73651c6117ef549cecc26b3f0", kill_on_drop: false }`
[INFO] [stdout] 1e684dce90388b92d27817438473707571a762f73651c6117ef549cecc26b3f0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6ee8d915e0c54fe6bbe0fd0257f59e3dd5953a9663edb5bc7afd1112be58aab4
[INFO] running `Command { std: "docker" "start" "-a" "6ee8d915e0c54fe6bbe0fd0257f59e3dd5953a9663edb5bc7afd1112be58aab4", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `InsertError`, `RemoveError`, `ReplaceError`, and `UpdateError`
[INFO] [stderr]  --> src/immutable.rs:3:26
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub use super::mutable::{InsertError, RemoveError, ReplaceError, UpdateError};
[INFO] [stderr]   |                          ^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/immutable.rs:122:17
[INFO] [stderr]     |
[INFO] [stderr] 122 |     pub fn iter(&self) -> HamtIter<K, V> {
[INFO] [stderr]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 122 |     pub fn iter(&self) -> HamtIter<'_, K, V> {
[INFO] [stderr]     |                                    +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/node.rs:140:17
[INFO] [stderr]     |
[INFO] [stderr] 140 |     pub fn iter(&self) -> NodeIter<K, V> {
[INFO] [stderr]     |                 ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 140 |     pub fn iter(&self) -> NodeIter<'_, K, V> {
[INFO] [stderr]     |                                    +++
[INFO] [stderr] 
[INFO] [stderr] warning: `hamst` (lib) generated 3 warnings (run `cargo fix --lib -p hamst` to apply 3 suggestions)
[INFO] [stderr] warning: `hamst` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/hamst-8bf9f5eba104694c)
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test tests::delete_key_not_exist ... ok
[INFO] [stdout] test tests::delete_value_not_match ... ok
[INFO] [stdout] test tests::delete ... ok
[INFO] [stdout] test hash::tests::hash_is_deterministic ... ok
[INFO] [stdout] test tests::dup_insert ... ok
[INFO] [stdout] test tests::empty_size ... ok
[INFO] [stdout] test tests::insert_lookup ... ok
[INFO] [stdout] test tests::insert_equivalent ... ok
[INFO] [stdout] test tests::plan_equivalent ... ok
[INFO] [stdout] test tests::iter_equivalent ... ok
[INFO] [stdout] test tests::large_insert_equivalent ... ok
[INFO] [stderr]    Doc-tests hamst
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 10.48s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/hamt.rs - hamt::hamt (line 8) ... ignored
[INFO] [stdout] test src/immutable.rs - immutable::Hamt<K,V,H>::mutate_freeze (line 68) ... FAILED
[INFO] [stdout] test src/hamt.rs - hamt::hamt (line 14) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/immutable.rs - immutable::Hamt<K,V,H>::mutate_freeze (line 68) stdout ----
[INFO] [stdout] error[E0425]: cannot find value `reference` in this scope
[INFO] [stdout]   --> src/immutable.rs:74:14
[INFO] [stdout]    |
[INFO] [stdout] 74 | let result = reference.freeze(|x| {
[INFO] [stdout]    |              ^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/immutable.rs:74:32
[INFO] [stdout]    |
[INFO] [stdout] 74 | let result = reference.freeze(|x| {
[INFO] [stdout]    |                                ^
[INFO] [stdout] 75 |     x.insert(10, 20)?;
[INFO] [stdout]    |     - type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving this closure parameter an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 74 | let result = reference.freeze(|x: /* Type */| {
[INFO] [stdout]    |                                 ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0425.
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/immutable.rs - immutable::Hamt<K,V,H>::mutate_freeze (line 68)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 1 passed; 1 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.61s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "6ee8d915e0c54fe6bbe0fd0257f59e3dd5953a9663edb5bc7afd1112be58aab4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ee8d915e0c54fe6bbe0fd0257f59e3dd5953a9663edb5bc7afd1112be58aab4", kill_on_drop: false }`
[INFO] [stdout] 6ee8d915e0c54fe6bbe0fd0257f59e3dd5953a9663edb5bc7afd1112be58aab4
