[INFO] updating cached repository https://github.com/LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/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] 19489252d5d7b675fb202a92ea9aa20395addd31
[INFO] checking LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust against try#e689e5eaefe96e6dc3ed5bb629c521b7d207aff7 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FLooMaclin%2Freproduce_make_mut_inspection_bug_intellij_idea_rust" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust on toolchain e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust
[INFO] finished tweaking git repo https://github.com/LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust
[INFO] tweaked toml for git repo https://github.com/LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/LooMaclin/reproduce_make_mut_inspection_bug_intellij_idea_rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] ae91e3d6742b189562644911bbd7819dc86543c08df671f70264d07ebcba43d0
[INFO] running `"docker" "start" "-a" "ae91e3d6742b189562644911bbd7819dc86543c08df671f70264d07ebcba43d0"`
[INFO] [stderr]     Checking reproduce_make_mut_inspection_bug_intellij_idea_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]  --> src/main.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn test((a,b): (String, String)) {
[INFO] [stderr]   |            ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `a` as mutable, as it is not declared as mutable
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn test((a,b): (String, String)) {
[INFO] [stderr]   |          - help: consider changing this to be mutable: `mut a`
[INFO] [stderr] 3 |     a.insert(0, 'b');
[INFO] [stderr]   |     ^ cannot borrow as mutable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0596`.
[INFO] [stderr] error: Could not compile `reproduce_make_mut_inspection_bug_intellij_idea_rust`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]  --> src/main.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn test((a,b): (String, String)) {
[INFO] [stderr]   |            ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `a` as mutable, as it is not declared as mutable
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn test((a,b): (String, String)) {
[INFO] [stderr]   |          - help: consider changing this to be mutable: `mut a`
[INFO] [stderr] 3 |     a.insert(0, 'b');
[INFO] [stderr]   |     ^ cannot borrow as mutable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0596`.
[INFO] [stderr] error: Could not compile `reproduce_make_mut_inspection_bug_intellij_idea_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "ae91e3d6742b189562644911bbd7819dc86543c08df671f70264d07ebcba43d0"`
[INFO] running `"docker" "rm" "-f" "ae91e3d6742b189562644911bbd7819dc86543c08df671f70264d07ebcba43d0"`
[INFO] [stdout] ae91e3d6742b189562644911bbd7819dc86543c08df671f70264d07ebcba43d0