[INFO] cloning repository https://github.com/akuraj/learn_rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/akuraj/learn_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakuraj%2Flearn_rust"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakuraj%2Flearn_rust'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e11f859728e5a1c5cd657f5ddcb7c2ba8bc1f50
[INFO] checking akuraj/learn_rust against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakuraj%2Flearn_rust" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/akuraj/learn_rust on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/akuraj/learn_rust
[INFO] finished tweaking git repo https://github.com/akuraj/learn_rust
[INFO] tweaked toml for git repo https://github.com/akuraj/learn_rust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/akuraj/learn_rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4a32699b61782b894b29664f8a17e891a92d5a92b6fac3c0ab8494b28d2d900c
[INFO] running `"docker" "start" "-a" "4a32699b61782b894b29664f8a17e891a92d5a92b6fac3c0ab8494b28d2d900c"`
[INFO] [stderr]     Checking learn_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:10:23
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn apply( &self, &Apply<T, R >, T ) -> R;
[INFO] [stderr]    |                       ^^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R >`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:13:47
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl<T, R, F> Apply<T, R> for F where F: Fn( &Apply<T, R>, T ) -> R {
[INFO] [stderr]    |                                               ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:14:26
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn apply( &self, f: &Apply<T, R>, t: T ) -> R {
[INFO] [stderr]    |                          ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:28:59
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn y_apply<T, R, F>( f: &F, t: T ) -> R where F: Fn( &Fn( T ) -> R, T ) -> R {
[INFO] [stderr]    |                                                           ^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     ( &|x: &Apply<T, R>, y| x.apply( x, y ) )
[INFO] [stderr]    |             ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:30:19
[INFO] [stderr]    |
[INFO] [stderr] 30 |     .apply( &|x: &Apply<T, R>, y| f( &|z| x.apply( x, z ), y ), t )
[INFO] [stderr]    |                   ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:43:42
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn y<T: 'static, R: 'static>( f: Box<Fn( &Fn( T ) -> R, T ) -> R> ) -> Box<Fn( T ) -> R> {
[INFO] [stderr]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( &Fn( T ) -> R, T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:43:47
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn y<T: 'static, R: 'static>( f: Box<Fn( &Fn( T ) -> R, T ) -> R> ) -> Box<Fn( T ) -> R> {
[INFO] [stderr]    |                                               ^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:43:80
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn y<T: 'static, R: 'static>( f: Box<Fn( &Fn( T ) -> R, T ) -> R> ) -> Box<Fn( T ) -> R> {
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:44:35
[INFO] [stderr]    |
[INFO] [stderr] 44 |     Box::new( move |t: T| ( &|x: &Apply<T, R>, y| x.apply( x, y ) )
[INFO] [stderr]    |                                   ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:45:41
[INFO] [stderr]    |
[INFO] [stderr] 45 |                           .apply( &|x: &Apply<T, R>, y| f( &|z| x.apply( x, z ), y ), t ) )
[INFO] [stderr]    |                                         ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:54:37
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let almost_fac = Box::new( |f: &Fn( usize ) -> usize, x| if x == 0 { 1 } else { x * f( x - 1 ) } );
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( usize ) -> usize`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:60:37
[INFO] [stderr]    |
[INFO] [stderr] 60 |     let almost_fib = Box::new( |f: &Fn( usize ) -> usize, x| if x < 2 { x } else { f( x - 2 ) + f( x - 1 ) } );
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( usize ) -> usize`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/test_lifetimes.rs:1:34
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
[INFO] [stderr]   |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]  --> src/test_lifetimes.rs:1:58
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
[INFO] [stderr]   |                                                          ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `a` is assigned to, but never used
[INFO] [stderr]  --> src/test_lifetimes.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let a: &u32;
[INFO] [stderr]   |         ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider using `_a` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `a` is never read
[INFO] [stderr]   --> src/test_lifetimes.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         a = {
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:10:23
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn apply( &self, &Apply<T, R >, T ) -> R;
[INFO] [stderr]    |                       ^^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R >`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:13:47
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl<T, R, F> Apply<T, R> for F where F: Fn( &Apply<T, R>, T ) -> R {
[INFO] [stderr]    |                                               ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:14:26
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn apply( &self, f: &Apply<T, R>, t: T ) -> R {
[INFO] [stderr]    |                          ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:28:59
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn y_apply<T, R, F>( f: &F, t: T ) -> R where F: Fn( &Fn( T ) -> R, T ) -> R {
[INFO] [stderr]    |                                                           ^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     ( &|x: &Apply<T, R>, y| x.apply( x, y ) )
[INFO] [stderr]    |             ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:30:19
[INFO] [stderr]    |
[INFO] [stderr] 30 |     .apply( &|x: &Apply<T, R>, y| f( &|z| x.apply( x, z ), y ), t )
[INFO] [stderr]    |                   ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:43:42
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn y<T: 'static, R: 'static>( f: Box<Fn( &Fn( T ) -> R, T ) -> R> ) -> Box<Fn( T ) -> R> {
[INFO] [stderr]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( &Fn( T ) -> R, T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:43:47
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn y<T: 'static, R: 'static>( f: Box<Fn( &Fn( T ) -> R, T ) -> R> ) -> Box<Fn( T ) -> R> {
[INFO] [stderr]    |                                               ^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:43:80
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn y<T: 'static, R: 'static>( f: Box<Fn( &Fn( T ) -> R, T ) -> R> ) -> Box<Fn( T ) -> R> {
[INFO] [stderr]    |                                                                                ^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( T ) -> R`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:44:35
[INFO] [stderr]    |
[INFO] [stderr] 44 |     Box::new( move |t: T| ( &|x: &Apply<T, R>, y| x.apply( x, y ) )
[INFO] [stderr]    |                                   ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:45:41
[INFO] [stderr]    |
[INFO] [stderr] 45 |                           .apply( &|x: &Apply<T, R>, y| f( &|z| x.apply( x, z ), y ), t ) )
[INFO] [stderr]    |                                         ^^^^^^^^^^^ help: use `dyn`: `dyn Apply<T, R>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:54:37
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let almost_fac = Box::new( |f: &Fn( usize ) -> usize, x| if x == 0 { 1 } else { x * f( x - 1 ) } );
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( usize ) -> usize`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/y_combinator.rs:60:37
[INFO] [stderr]    |
[INFO] [stderr] 60 |     let almost_fib = Box::new( |f: &Fn( usize ) -> usize, x| if x < 2 { x } else { f( x - 2 ) + f( x - 1 ) } );
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn( usize ) -> usize`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/test_lifetimes.rs:1:34
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
[INFO] [stderr]   |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]  --> src/test_lifetimes.rs:1:58
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
[INFO] [stderr]   |                                                          ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `a` is assigned to, but never used
[INFO] [stderr]  --> src/test_lifetimes.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let a: &u32;
[INFO] [stderr]   |         ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider using `_a` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `a` is never read
[INFO] [stderr]   --> src/test_lifetimes.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         a = {
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `"docker" "inspect" "4a32699b61782b894b29664f8a17e891a92d5a92b6fac3c0ab8494b28d2d900c"`
[INFO] running `"docker" "rm" "-f" "4a32699b61782b894b29664f8a17e891a92d5a92b6fac3c0ab8494b28d2d900c"`
[INFO] [stdout] 4a32699b61782b894b29664f8a17e891a92d5a92b6fac3c0ab8494b28d2d900c