[INFO] fetching crate structbuf 0.3.4...
[INFO] testing structbuf-0.3.4 against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] extracting crate structbuf 0.3.4 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate structbuf 0.3.4
[INFO] finished tweaking crates.io crate structbuf 0.3.4
[INFO] tweaked toml for crates.io crate structbuf 0.3.4 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate structbuf 0.3.4 on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "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" "+b83b707f97d809763b7861afa7638871f3339a33" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 32cab6aa06c7ae7a1775a3089525d91e9d7e73d6224b2df6b8d6fcecc12d32ee
[INFO] running `Command { std: "docker" "start" "-a" "32cab6aa06c7ae7a1775a3089525d91e9d7e73d6224b2df6b8d6fcecc12d32ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "32cab6aa06c7ae7a1775a3089525d91e9d7e73d6224b2df6b8d6fcecc12d32ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32cab6aa06c7ae7a1775a3089525d91e9d7e73d6224b2df6b8d6fcecc12d32ee", kill_on_drop: false }`
[INFO] [stdout] 32cab6aa06c7ae7a1775a3089525d91e9d7e73d6224b2df6b8d6fcecc12d32ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] edb7689d03bb71281c129c22de54a04686c084c6a81ad1a76b5f1264bee49328
[INFO] running `Command { std: "docker" "start" "-a" "edb7689d03bb71281c129c22de54a04686c084c6a81ad1a76b5f1264bee49328", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling structbuf v0.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary qualification
[INFO] [stdout]    --> src/lib.rs:780:53
[INFO] [stdout]     |
[INFO] [stdout] 780 |         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:43:9
[INFO] [stdout]     |
[INFO] [stdout]  43 | #![warn(unused_qualifications)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] help: remove the unnecessary path segments
[INFO] [stdout]     |
[INFO] [stdout] 780 -         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stdout] 780 +         if let Some(rem) = self.0.len().checked_sub(size_of::<T>()) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` attribute cannot be used on trait methods in impl blocks
[INFO] [stdout]    --> src/lib.rs:804:5
[INFO] [stdout]     |
[INFO] [stdout] 804 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[must_use]` can be applied to data types, functions, unions, required trait methods, provided trait methods, inherent methods, foreign functions, and traits
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (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/lib.rs:101:15
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn append(&mut self) -> Packer;
[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] 101 |     fn append(&mut self) -> Packer<'_>;
[INFO] [stdout]     |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:106:11
[INFO] [stdout]     |
[INFO] [stdout] 106 |     fn at(&mut self, i: usize) -> Packer;
[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] 106 |     fn at(&mut self, i: usize) -> Packer<'_>;
[INFO] [stdout]     |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:112:15
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn unpack(&self) -> Unpacker;
[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] 112 |     fn unpack(&self) -> Unpacker<'_>;
[INFO] [stdout]     |                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:118:15
[INFO] [stdout]     |
[INFO] [stdout] 118 |     fn unpack(&self) -> Unpacker {
[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] 118 |     fn unpack(&self) -> Unpacker<'_> {
[INFO] [stdout]     |                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:336:15
[INFO] [stdout]     |
[INFO] [stdout] 336 |     fn append(&mut self) -> Packer {
[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] 336 |     fn append(&mut self) -> Packer<'_> {
[INFO] [stdout]     |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:341:11
[INFO] [stdout]     |
[INFO] [stdout] 341 |     fn at(&mut self, i: usize) -> Packer {
[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] 341 |     fn at(&mut self, i: usize) -> Packer<'_> {
[INFO] [stdout]     |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `Command { std: "docker" "inspect" "edb7689d03bb71281c129c22de54a04686c084c6a81ad1a76b5f1264bee49328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edb7689d03bb71281c129c22de54a04686c084c6a81ad1a76b5f1264bee49328", kill_on_drop: false }`
[INFO] [stdout] edb7689d03bb71281c129c22de54a04686c084c6a81ad1a76b5f1264bee49328
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6451ff7a721e505f01ff8664268c737fd3dffa2441446f5db93a477ee3ed851c
[INFO] running `Command { std: "docker" "start" "-a" "6451ff7a721e505f01ff8664268c737fd3dffa2441446f5db93a477ee3ed851c", kill_on_drop: false }`
[INFO] [stdout] warning: unnecessary qualification
[INFO] [stdout]    --> src/lib.rs:780:53
[INFO] [stdout]     |
[INFO] [stdout] 780 |         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:43:9
[INFO] [stdout]     |
[INFO] [stdout]  43 | #![warn(unused_qualifications)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] help: remove the unnecessary path segments
[INFO] [stdout]     |
[INFO] [stdout] 780 -         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stdout] 780 +         if let Some(rem) = self.0.len().checked_sub(size_of::<T>()) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` attribute cannot be used on trait methods in impl blocks
[INFO] [stdout]    --> src/lib.rs:804:5
[INFO] [stdout]     |
[INFO] [stdout] 804 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[must_use]` can be applied to data types, functions, unions, required trait methods, provided trait methods, inherent methods, foreign functions, and traits
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (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/lib.rs:101:15
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn append(&mut self) -> Packer;
[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] 101 |     fn append(&mut self) -> Packer<'_>;
[INFO] [stdout]     |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:106:11
[INFO] [stdout]     |
[INFO] [stdout] 106 |     fn at(&mut self, i: usize) -> Packer;
[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] 106 |     fn at(&mut self, i: usize) -> Packer<'_>;
[INFO] [stdout]     |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:112:15
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn unpack(&self) -> Unpacker;
[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] 112 |     fn unpack(&self) -> Unpacker<'_>;
[INFO] [stdout]     |                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:118:15
[INFO] [stdout]     |
[INFO] [stdout] 118 |     fn unpack(&self) -> Unpacker {
[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] 118 |     fn unpack(&self) -> Unpacker<'_> {
[INFO] [stdout]     |                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:336:15
[INFO] [stdout]     |
[INFO] [stdout] 336 |     fn append(&mut self) -> Packer {
[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] 336 |     fn append(&mut self) -> Packer<'_> {
[INFO] [stdout]     |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:341:11
[INFO] [stdout]     |
[INFO] [stdout] 341 |     fn at(&mut self, i: usize) -> Packer {
[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] 341 |     fn at(&mut self, i: usize) -> Packer<'_> {
[INFO] [stdout]     |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling structbuf v0.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary qualification
[INFO] [stdout]    --> src/lib.rs:780:53
[INFO] [stdout]     |
[INFO] [stdout] 780 |         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:43:9
[INFO] [stdout]     |
[INFO] [stdout]  43 | #![warn(unused_qualifications)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] help: remove the unnecessary path segments
[INFO] [stdout]     |
[INFO] [stdout] 780 -         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stdout] 780 +         if let Some(rem) = self.0.len().checked_sub(size_of::<T>()) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` attribute cannot be used on trait methods in impl blocks
[INFO] [stdout]    --> src/lib.rs:804:5
[INFO] [stdout]     |
[INFO] [stdout] 804 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[must_use]` can be applied to data types, functions, unions, required trait methods, provided trait methods, inherent methods, foreign functions, and traits
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (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/lib.rs:101:15
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn append(&mut self) -> Packer;
[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] 101 |     fn append(&mut self) -> Packer<'_>;
[INFO] [stdout]     |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:106:11
[INFO] [stdout]     |
[INFO] [stdout] 106 |     fn at(&mut self, i: usize) -> Packer;
[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] 106 |     fn at(&mut self, i: usize) -> Packer<'_>;
[INFO] [stdout]     |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:112:15
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn unpack(&self) -> Unpacker;
[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] 112 |     fn unpack(&self) -> Unpacker<'_>;
[INFO] [stdout]     |                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:118:15
[INFO] [stdout]     |
[INFO] [stdout] 118 |     fn unpack(&self) -> Unpacker {
[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] 118 |     fn unpack(&self) -> Unpacker<'_> {
[INFO] [stdout]     |                                 ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:336:15
[INFO] [stdout]     |
[INFO] [stdout] 336 |     fn append(&mut self) -> Packer {
[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] 336 |     fn append(&mut self) -> Packer<'_> {
[INFO] [stdout]     |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:341:11
[INFO] [stdout]     |
[INFO] [stdout] 341 |     fn at(&mut self, i: usize) -> Packer {
[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] 341 |     fn at(&mut self, i: usize) -> Packer<'_> {
[INFO] [stdout]     |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "6451ff7a721e505f01ff8664268c737fd3dffa2441446f5db93a477ee3ed851c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6451ff7a721e505f01ff8664268c737fd3dffa2441446f5db93a477ee3ed851c", kill_on_drop: false }`
[INFO] [stdout] 6451ff7a721e505f01ff8664268c737fd3dffa2441446f5db93a477ee3ed851c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 571057af6a0fde73e879e3757361d7a7b67086e52f1c2c15b7be56a237878f7b
[INFO] running `Command { std: "docker" "start" "-a" "571057af6a0fde73e879e3757361d7a7b67086e52f1c2c15b7be56a237878f7b", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary qualification
[INFO] [stderr]    --> src/lib.rs:780:53
[INFO] [stderr]     |
[INFO] [stderr] 780 |         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]    --> src/lib.rs:43:9
[INFO] [stderr]     |
[INFO] [stderr]  43 | #![warn(unused_qualifications)]
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] help: remove the unnecessary path segments
[INFO] [stderr]     |
[INFO] [stderr] 780 -         if let Some(rem) = self.0.len().checked_sub(mem::size_of::<T>()) {
[INFO] [stderr] 780 +         if let Some(rem) = self.0.len().checked_sub(size_of::<T>()) {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `#[must_use]` attribute cannot be used on trait methods in impl blocks
[INFO] [stderr]    --> src/lib.rs:804:5
[INFO] [stderr]     |
[INFO] [stderr] 804 |     #[must_use]
[INFO] [stderr]     |     ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = help: `#[must_use]` can be applied to data types, functions, unions, required trait methods, provided trait methods, inherent methods, foreign functions, and traits
[INFO] [stderr]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:101:15
[INFO] [stderr]     |
[INFO] [stderr] 101 |     fn append(&mut self) -> Packer;
[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] 101 |     fn append(&mut self) -> Packer<'_>;
[INFO] [stderr]     |                                   ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:106:11
[INFO] [stderr]     |
[INFO] [stderr] 106 |     fn at(&mut self, i: usize) -> Packer;
[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] 106 |     fn at(&mut self, i: usize) -> Packer<'_>;
[INFO] [stderr]     |                                         ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:112:15
[INFO] [stderr]     |
[INFO] [stderr] 112 |     fn unpack(&self) -> Unpacker;
[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] 112 |     fn unpack(&self) -> Unpacker<'_>;
[INFO] [stderr]     |                                 ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:118:15
[INFO] [stderr]     |
[INFO] [stderr] 118 |     fn unpack(&self) -> Unpacker {
[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] 118 |     fn unpack(&self) -> Unpacker<'_> {
[INFO] [stderr]     |                                 ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:336:15
[INFO] [stderr]     |
[INFO] [stderr] 336 |     fn append(&mut self) -> Packer {
[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] 336 |     fn append(&mut self) -> Packer<'_> {
[INFO] [stderr]     |                                   ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/lib.rs:341:11
[INFO] [stderr]     |
[INFO] [stderr] 341 |     fn at(&mut self, i: usize) -> Packer {
[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] 341 |     fn at(&mut self, i: usize) -> Packer<'_> {
[INFO] [stderr]     |                                         ++++
[INFO] [stderr] 
[INFO] [stderr] warning: `structbuf` (lib) generated 8 warnings (run `cargo fix --lib -p structbuf` to apply 8 suggestions)
[INFO] [stderr] warning: `structbuf` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/structbuf-e0ca1c67d1c0c002)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test tests::packer ... ok
[INFO] [stdout] test tests::packer_pad ... ok
[INFO] [stdout] test tests::packer_overwrite ... ok
[INFO] [stdout] test tests::unpacker ... ok
[INFO] [stdout] test tests::unpacker_take ... ok
[INFO] [stdout] test tests::unpacker_skip ... ok
[INFO] [stdout] test tests::packer_limit - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests structbuf
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/lib.rs - Unpacker<'a>::skip (line 647) ... ok
[INFO] [stdout] test src/lib.rs - (line 20) ... ok
[INFO] [stdout] test src/lib.rs - StructBuf::put_at (line 280) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.20s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "571057af6a0fde73e879e3757361d7a7b67086e52f1c2c15b7be56a237878f7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "571057af6a0fde73e879e3757361d7a7b67086e52f1c2c15b7be56a237878f7b", kill_on_drop: false }`
[INFO] [stdout] 571057af6a0fde73e879e3757361d7a7b67086e52f1c2c15b7be56a237878f7b