[INFO] cloning repository https://github.com/ramsaycarslaw/mt_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ramsaycarslaw/mt_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Framsaycarslaw%2Fmt_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Framsaycarslaw%2Fmt_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3a7ecd18107fae9c7c8cb2b324c70574d4a4df89
[INFO] checking ramsaycarslaw/mt_rust against try#c4ca24658d934444a28db36abebef17a8651701a for pr-144156
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Framsaycarslaw%2Fmt_rust" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ramsaycarslaw/mt_rust
[INFO] finished tweaking git repo https://github.com/ramsaycarslaw/mt_rust
[INFO] tweaked toml for git repo https://github.com/ramsaycarslaw/mt_rust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ramsaycarslaw/mt_rust on toolchain c4ca24658d934444a28db36abebef17a8651701a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c4ca24658d934444a28db36abebef17a8651701a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ramsaycarslaw/mt_rust 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" "+c4ca24658d934444a28db36abebef17a8651701a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+c4ca24658d934444a28db36abebef17a8651701a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 045e6d429ee47bdf40b8f0e88cf6906138f2bbe5bbae79f288cea485a3d6434e
[INFO] running `Command { std: "docker" "start" "-a" "045e6d429ee47bdf40b8f0e88cf6906138f2bbe5bbae79f288cea485a3d6434e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "045e6d429ee47bdf40b8f0e88cf6906138f2bbe5bbae79f288cea485a3d6434e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "045e6d429ee47bdf40b8f0e88cf6906138f2bbe5bbae79f288cea485a3d6434e", kill_on_drop: false }`
[INFO] [stdout] 045e6d429ee47bdf40b8f0e88cf6906138f2bbe5bbae79f288cea485a3d6434e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+c4ca24658d934444a28db36abebef17a8651701a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cacd8f4ad576a7b218078ffe9c9737a383bf5818fffc2532fe17f6c1268ee03f
[INFO] running `Command { std: "docker" "start" "-a" "cacd8f4ad576a7b218078ffe9c9737a383bf5818fffc2532fe17f6c1268ee03f", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.66
[INFO] [stderr]     Checking mt v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variants `Variable` and `Null` are never constructed
[INFO] [stdout]   --> src/ast.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub enum Expression {
[INFO] [stdout]    |          ---------- variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 13 |     Variable(String),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 14 |     Assign(String, Box<Expression>),
[INFO] [stdout] 15 |     Null,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Expression` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_from` is never used
[INFO] [stdout]   --> src/environment.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Environment {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn new_from(enclosing: Environment) -> Environment {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Variable` and `Null` are never constructed
[INFO] [stdout]   --> src/ast.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub enum Expression {
[INFO] [stdout]    |          ---------- variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 13 |     Variable(String),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 14 |     Assign(String, Box<Expression>),
[INFO] [stdout] 15 |     Null,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Expression` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_from` is never used
[INFO] [stdout]   --> src/environment.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Environment {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn new_from(enclosing: Environment) -> Environment {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "cacd8f4ad576a7b218078ffe9c9737a383bf5818fffc2532fe17f6c1268ee03f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cacd8f4ad576a7b218078ffe9c9737a383bf5818fffc2532fe17f6c1268ee03f", kill_on_drop: false }`
[INFO] [stdout] cacd8f4ad576a7b218078ffe9c9737a383bf5818fffc2532fe17f6c1268ee03f