[INFO] cloning repository https://github.com/reshmi789/immutable_var
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/reshmi789/immutable_var" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Freshmi789%2Fimmutable_var", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Freshmi789%2Fimmutable_var'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e4e32a87b0c8afdd2b71f66add5d13c28c5c076
[INFO] building reshmi789/immutable_var against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Freshmi789%2Fimmutable_var" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/reshmi789/immutable_var
[INFO] finished tweaking git repo https://github.com/reshmi789/immutable_var
[INFO] tweaked toml for git repo https://github.com/reshmi789/immutable_var written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/reshmi789/immutable_var on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/reshmi789/immutable_var 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" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5e4497e3762f16aec98e9798138909a0bb2971ae2aa5db8e088c7491f87eed5d
[INFO] running `Command { std: "docker" "start" "-a" "5e4497e3762f16aec98e9798138909a0bb2971ae2aa5db8e088c7491f87eed5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e4497e3762f16aec98e9798138909a0bb2971ae2aa5db8e088c7491f87eed5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e4497e3762f16aec98e9798138909a0bb2971ae2aa5db8e088c7491f87eed5d", kill_on_drop: false }`
[INFO] [stdout] 5e4497e3762f16aec98e9798138909a0bb2971ae2aa5db8e088c7491f87eed5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab3c44bbe7123d762fd9315064b9a0dca36afec2ab5cceb2373826ead17254c2
[INFO] running `Command { std: "docker" "start" "-a" "ab3c44bbe7123d762fd9315064b9a0dca36afec2ab5cceb2373826ead17254c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling immutable_var v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: format argument must be a string literal
[INFO] [stdout]  --> src/main.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 |     println!(spaces);
[INFO] [stdout]   |              ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] help: you might be missing a string literal to format with
[INFO] [stdout]   |
[INFO] [stdout] 4 |     println!("{}", spaces);
[INFO] [stdout]   |              +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/main.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut spaces = "   ";
[INFO] [stdout]   |                      ----- expected due to this value
[INFO] [stdout] 3 |     spaces = spaces.len();
[INFO] [stdout]   |              ^^^^^^^^^^^^ expected `&str`, found `usize`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `immutable_var` (bin "immutable_var") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ab3c44bbe7123d762fd9315064b9a0dca36afec2ab5cceb2373826ead17254c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab3c44bbe7123d762fd9315064b9a0dca36afec2ab5cceb2373826ead17254c2", kill_on_drop: false }`
[INFO] [stdout] ab3c44bbe7123d762fd9315064b9a0dca36afec2ab5cceb2373826ead17254c2