[INFO] updating cached repository https://github.com/morozik11/lessons
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c4266c7c80d092361a5a0c19a712c1bb0bc0e908
[INFO] testing morozik11/lessons against try#41997647ba6a77908f6ef64401414feb00bccf16 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmorozik11%2Flessons" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/morozik11/lessons on toolchain 41997647ba6a77908f6ef64401414feb00bccf16
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/morozik11/lessons
[INFO] finished tweaking git repo https://github.com/morozik11/lessons
[INFO] tweaked toml for git repo https://github.com/morozik11/lessons written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/morozik11/lessons already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "build" "--frozen"`
[INFO] [stdout] 75b26359f9f05fad9c5b7fa102ba21b0cd88fe2dbeef2da9cb9b48dcc325e9c3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "75b26359f9f05fad9c5b7fa102ba21b0cd88fe2dbeef2da9cb9b48dcc325e9c3"`
[INFO] [stderr]    Compiling alg v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `closure_annotated`
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let mut closure_annotated = |x: &mut u32| {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closure_annotated`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/main.rs:54:13
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let result = self.head.as_mut().map(|vertex| vertex.push_left(elem));
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/main.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |         let result = self.head.as_mut().map(|vertex| vertex.push_right(elem));
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:47:36
[INFO] [stderr]    |
[INFO] [stderr] 47 |     pub fn recursion<F>(&mut self, mut f: &mut F)
[INFO] [stderr]    |                                    ----^
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:81:36
[INFO] [stderr]    |
[INFO] [stderr] 81 |     pub fn recursion<F>(&mut self, mut f: &mut F)
[INFO] [stderr]    |                                    ----^
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let mut closure_annotated = |x: &mut u32| {
[INFO] [stderr]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.09s
[INFO] running `"docker" "inspect" "75b26359f9f05fad9c5b7fa102ba21b0cd88fe2dbeef2da9cb9b48dcc325e9c3"`
[INFO] running `"docker" "rm" "-f" "75b26359f9f05fad9c5b7fa102ba21b0cd88fe2dbeef2da9cb9b48dcc325e9c3"`
[INFO] [stdout] 75b26359f9f05fad9c5b7fa102ba21b0cd88fe2dbeef2da9cb9b48dcc325e9c3
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "test" "--frozen" "--no-run"`
[INFO] [stdout] dd55d549c6d413f71b32b33802d8210c9786784e7487877cea8df433d1010527
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "dd55d549c6d413f71b32b33802d8210c9786784e7487877cea8df433d1010527"`
[INFO] [stderr]    Compiling alg v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `closure_annotated`
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let mut closure_annotated = |x: &mut u32| {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closure_annotated`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/main.rs:54:13
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let result = self.head.as_mut().map(|vertex| vertex.push_left(elem));
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/main.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |         let result = self.head.as_mut().map(|vertex| vertex.push_right(elem));
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:47:36
[INFO] [stderr]    |
[INFO] [stderr] 47 |     pub fn recursion<F>(&mut self, mut f: &mut F)
[INFO] [stderr]    |                                    ----^
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:81:36
[INFO] [stderr]    |
[INFO] [stderr] 81 |     pub fn recursion<F>(&mut self, mut f: &mut F)
[INFO] [stderr]    |                                    ----^
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let mut closure_annotated = |x: &mut u32| {
[INFO] [stderr]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `"docker" "inspect" "dd55d549c6d413f71b32b33802d8210c9786784e7487877cea8df433d1010527"`
[INFO] running `"docker" "rm" "-f" "dd55d549c6d413f71b32b33802d8210c9786784e7487877cea8df433d1010527"`
[INFO] [stdout] dd55d549c6d413f71b32b33802d8210c9786784e7487877cea8df433d1010527
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+41997647ba6a77908f6ef64401414feb00bccf16" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9643de92837e0c1a8971eee892c202cffc2bed72ce8cac0eeef9cddddb5a9d50
[INFO] running `"docker" "start" "-a" "9643de92837e0c1a8971eee892c202cffc2bed72ce8cac0eeef9cddddb5a9d50"`
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `closure_annotated`
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let mut closure_annotated = |x: &mut u32| {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closure_annotated`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/main.rs:54:13
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let result = self.head.as_mut().map(|vertex| vertex.push_left(elem));
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/main.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |         let result = self.head.as_mut().map(|vertex| vertex.push_right(elem));
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:47:36
[INFO] [stderr]    |
[INFO] [stderr] 47 |     pub fn recursion<F>(&mut self, mut f: &mut F)
[INFO] [stderr]    |                                    ----^
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:81:36
[INFO] [stderr]    |
[INFO] [stderr] 81 |     pub fn recursion<F>(&mut self, mut f: &mut F)
[INFO] [stderr]    |                                    ----^
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let mut closure_annotated = |x: &mut u32| {
[INFO] [stderr]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/alg-8b662b5afd0b7fef
[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" "9643de92837e0c1a8971eee892c202cffc2bed72ce8cac0eeef9cddddb5a9d50"`
[INFO] running `"docker" "rm" "-f" "9643de92837e0c1a8971eee892c202cffc2bed72ce8cac0eeef9cddddb5a9d50"`
[INFO] [stdout] 9643de92837e0c1a8971eee892c202cffc2bed72ce8cac0eeef9cddddb5a9d50