[INFO] updating cached repository akuraj/learn_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/akuraj/learn_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/akuraj/learn_rust" "work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/akuraj/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/akuraj/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/akuraj/learn_rust" "work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/akuraj/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/akuraj/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e11f859728e5a1c5cd657f5ddcb7c2ba8bc1f50
[INFO] sha for GitHub repo akuraj/learn_rust: 8e11f859728e5a1c5cd657f5ddcb7c2ba8bc1f50
[INFO] validating manifest of akuraj/learn_rust on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of akuraj/learn_rust on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing akuraj/learn_rust
[INFO] finished frobbing akuraj/learn_rust
[INFO] frobbed toml for akuraj/learn_rust written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/akuraj/learn_rust/Cargo.toml
[INFO] started frobbing akuraj/learn_rust
[INFO] finished frobbing akuraj/learn_rust
[INFO] frobbed toml for akuraj/learn_rust written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/akuraj/learn_rust/Cargo.toml
[INFO] crate akuraj/learn_rust has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing akuraj/learn_rust against master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54 for pr-57967
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-4/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/akuraj/learn_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "build" "--frozen"`
[INFO] [stdout] 3f286e03f3e830e4b735d3f12263f9eed79ad8f51aba2ac9d90f7489e632465a
[INFO] running `"docker" "start" "-a" "3f286e03f3e830e4b735d3f12263f9eed79ad8f51aba2ac9d90f7489e632465a"`
[INFO] [stderr]    Compiling learn_rust v0.1.0 (/opt/crater/workdir)
[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 0.58s
[INFO] running `"docker" "inspect" "3f286e03f3e830e4b735d3f12263f9eed79ad8f51aba2ac9d90f7489e632465a"`
[INFO] running `"docker" "rm" "-f" "3f286e03f3e830e4b735d3f12263f9eed79ad8f51aba2ac9d90f7489e632465a"`
[INFO] [stdout] 3f286e03f3e830e4b735d3f12263f9eed79ad8f51aba2ac9d90f7489e632465a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-4/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/akuraj/learn_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 41f1ff55a88d34497cb49796903eeeea26fab4a69c9692e8cce6835dfe532ded
[INFO] running `"docker" "start" "-a" "41f1ff55a88d34497cb49796903eeeea26fab4a69c9692e8cce6835dfe532ded"`
[INFO] [stderr]    Compiling learn_rust v0.1.0 (/opt/crater/workdir)
[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 0.61s
[INFO] running `"docker" "inspect" "41f1ff55a88d34497cb49796903eeeea26fab4a69c9692e8cce6835dfe532ded"`
[INFO] running `"docker" "rm" "-f" "41f1ff55a88d34497cb49796903eeeea26fab4a69c9692e8cce6835dfe532ded"`
[INFO] [stdout] 41f1ff55a88d34497cb49796903eeeea26fab4a69c9692e8cce6835dfe532ded
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-4/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/akuraj/learn_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen"`
[INFO] [stdout] d25075867440ee6d9217bf6e5821a11cddab59d436741e71c4d0fac0a51be1fc
[INFO] running `"docker" "start" "-a" "d25075867440ee6d9217bf6e5821a11cddab59d436741e71c4d0fac0a51be1fc"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/learn_rust-cab909c954e6e444
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d25075867440ee6d9217bf6e5821a11cddab59d436741e71c4d0fac0a51be1fc"`
[INFO] running `"docker" "rm" "-f" "d25075867440ee6d9217bf6e5821a11cddab59d436741e71c4d0fac0a51be1fc"`
[INFO] [stdout] d25075867440ee6d9217bf6e5821a11cddab59d436741e71c4d0fac0a51be1fc