[INFO] cloning repository https://github.com/younger027/rust-exec
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/younger027/rust-exec" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyounger027%2Frust-exec", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyounger027%2Frust-exec'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 62753e7d679f0c6ad7874b9276cd70bf7e5dcb6e
[INFO] testing younger027/rust-exec against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyounger027%2Frust-exec" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/younger027/rust-exec
[INFO] finished tweaking git repo https://github.com/younger027/rust-exec
[INFO] tweaked toml for git repo https://github.com/younger027/rust-exec written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/younger027/rust-exec on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/younger027/rust-exec already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d2cc98a3419b57dc807b5d32f8906eaf6f21b8493da8eb9c85bdb37409ab9cc1
[INFO] running `Command { std: "docker" "start" "-a" "d2cc98a3419b57dc807b5d32f8906eaf6f21b8493da8eb9c85bdb37409ab9cc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2cc98a3419b57dc807b5d32f8906eaf6f21b8493da8eb9c85bdb37409ab9cc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2cc98a3419b57dc807b5d32f8906eaf6f21b8493da8eb9c85bdb37409ab9cc1", kill_on_drop: false }`
[INFO] [stdout] d2cc98a3419b57dc807b5d32f8906eaf6f21b8493da8eb9c85bdb37409ab9cc1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 09c2f4a9f5d08e558ee9d812ca3f126eb5bd3598d206805afe364968ab56cb50
[INFO] running `Command { std: "docker" "start" "-a" "09c2f4a9f5d08e558ee9d812ca3f126eb5bd3598d206805afe364968ab56cb50", kill_on_drop: false }`
[INFO] [stderr]    Compiling young v0.1.0 (/opt/rustwide/workdir/young)
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]    --> young/src/lib.rs:140:33
[INFO] [stdout]     |
[INFO] [stdout] 140 | fn return_string_reference() -> &String {
[INFO] [stdout]     |                                 ^ expected named lifetime parameter
[INFO] [stdout]     |
[INFO] [stdout]     = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
[INFO] [stdout] help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`
[INFO] [stdout]     |
[INFO] [stdout] 140 | fn return_string_reference() -> &'static String {
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] help: instead, you are more likely to want to return an owned value
[INFO] [stdout]     |
[INFO] [stdout] 140 - fn return_string_reference() -> &String {
[INFO] [stdout] 140 + fn return_string_reference() -> String {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> young/src/lib.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut s = String::from("hello");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> young/src/lib.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let r1 = &mut s;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> young/src/lib.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let r2 = &mut s;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> young/src/lib.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut s = String::from("hello");
[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] For more information about this error, try `rustc --explain E0106`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `young` (lib) due to 1 previous error; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "09c2f4a9f5d08e558ee9d812ca3f126eb5bd3598d206805afe364968ab56cb50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09c2f4a9f5d08e558ee9d812ca3f126eb5bd3598d206805afe364968ab56cb50", kill_on_drop: false }`
[INFO] [stdout] 09c2f4a9f5d08e558ee9d812ca3f126eb5bd3598d206805afe364968ab56cb50