[INFO] fetching crate lain 0.5.5...
[INFO] checking lain-0.5.5 against master#5518eaa946291f00471af8b254b2a1715f234882 for pr-120393-1
[INFO] extracting crate lain 0.5.5 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate lain 0.5.5 on toolchain 5518eaa946291f00471af8b254b2a1715f234882
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lain 0.5.5
[INFO] finished tweaking crates.io crate lain 0.5.5
[INFO] tweaked toml for crates.io crate lain 0.5.5 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded getrandom v0.1.16
[INFO] [stderr]   Downloaded num v0.2.1
[INFO] [stderr]   Downloaded num-iter v0.1.43
[INFO] [stderr]   Downloaded field-offset v0.3.6
[INFO] [stderr]   Downloaded lain_derive v0.5.5
[INFO] [stderr]   Downloaded num-bigint v0.2.6
[INFO] [stderr]   Downloaded rand_pcg v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24654d3dd1d10d40a84a99ea9abb7f65398c1359f11414b75dfc2159ad198759
[INFO] running `Command { std: "docker" "start" "-a" "24654d3dd1d10d40a84a99ea9abb7f65398c1359f11414b75dfc2159ad198759", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24654d3dd1d10d40a84a99ea9abb7f65398c1359f11414b75dfc2159ad198759", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24654d3dd1d10d40a84a99ea9abb7f65398c1359f11414b75dfc2159ad198759", kill_on_drop: false }`
[INFO] [stdout] 24654d3dd1d10d40a84a99ea9abb7f65398c1359f11414b75dfc2159ad198759
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93327f357669a981071f0eff0945f8d22e4e3b579d0737c737988b5e4b4e806e
[INFO] running `Command { std: "docker" "start" "-a" "93327f357669a981071f0eff0945f8d22e4e3b579d0737c737988b5e4b4e806e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling semver v1.0.21
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling memoffset v0.9.0
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling paste v1.0.14
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling field-offset v0.3.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]    Compiling lain_derive v0.5.5
[INFO] [stderr]     Checking lain v0.5.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]    --> src/lib.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 | #![feature(specialization)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]     = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]    --> src/lib.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 | #![feature(specialization)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]     = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:102:12
[INFO] [stdout]     |
[INFO] [stdout] 102 | #![feature(min_const_generics)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:102:12
[INFO] [stdout]     |
[INFO] [stdout] 102 | #![feature(min_const_generics)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:319:13
[INFO] [stdout]     |
[INFO] [stdout] 319 |         let mut constraints = constraints.and_then(|c| {
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:635:25
[INFO] [stdout]     |
[INFO] [stdout] 635 |                     let mut new_item = T::new_fuzzed(mutator, constraints);
[INFO] [stdout]     |                         ----^^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:777:25
[INFO] [stdout]     |
[INFO] [stdout] 777 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(*size / ...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:831:25
[INFO] [stdout]     |
[INFO] [stdout] 831 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(*size / ...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:319:13
[INFO] [stdout]     |
[INFO] [stdout] 319 |         let mut constraints = constraints.and_then(|c| {
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mutatable.rs:635:25
[INFO] [stdout]     |
[INFO] [stdout] 635 |                     let mut new_item = T::new_fuzzed(mutator, constraints);
[INFO] [stdout]     |                         ----^^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:777:25
[INFO] [stdout]     |
[INFO] [stdout] 777 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(*size / ...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/new_fuzzed.rs:831:25
[INFO] [stdout]     |
[INFO] [stdout] 831 |                       let mut per_item_max_size: Option<usize> = constraints.and_then(|c| c.max_size.as_ref().and_then(|size| Some(*size / ...
[INFO] [stdout]     |                           ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 858 | / impl_new_fuzzed_array!(
[INFO] [stdout] 859 | |     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
[INFO] [stdout] 860 | |     27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
[INFO] [stdout] 861 | |     51, 52, 53, 54, 55, 56, 57, 58, 59, 60
[INFO] [stdout] 862 | | );
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `impl_new_fuzzed_array` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `all_chances_succeed` is never read
[INFO] [stdout]   --> src/mutator.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct MutatorFlags {
[INFO] [stdout]    |        ------------ field in this struct
[INFO] [stdout] 34 |     field_count: Option<usize>,
[INFO] [stdout] 35 |     all_chances_succeed: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MutatorFlags` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/types.rs:109:29
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub(crate) struct AsciiChar(pub(crate) char);
[INFO] [stdout]     |                   --------- ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `AsciiChar` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub(crate) struct AsciiChar(());
[INFO] [stdout]     |                             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `all_chances_succeed` is never read
[INFO] [stdout]   --> src/mutator.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct MutatorFlags {
[INFO] [stdout]    |        ------------ field in this struct
[INFO] [stdout] 34 |     field_count: Option<usize>,
[INFO] [stdout] 35 |     all_chances_succeed: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MutatorFlags` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/types.rs:109:29
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub(crate) struct AsciiChar(pub(crate) char);
[INFO] [stdout]     |                   --------- ^^^^^^^^^^^^^^^
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `AsciiChar` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub(crate) struct AsciiChar(());
[INFO] [stdout]     |                             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.88s
[INFO] running `Command { std: "docker" "inspect" "93327f357669a981071f0eff0945f8d22e4e3b579d0737c737988b5e4b4e806e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93327f357669a981071f0eff0945f8d22e4e3b579d0737c737988b5e4b4e806e", kill_on_drop: false }`
[INFO] [stdout] 93327f357669a981071f0eff0945f8d22e4e3b579d0737c737988b5e4b4e806e
