[INFO] cloning repository https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mesaverde0207/toy-c-compiler-in-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e5cfe794d04bb0e1771d2b770b32a4fbf9d8e06d
[INFO] checking mesaverde0207/toy-c-compiler-in-rust against master#f8f6997469237299c1d60814c7b9828602a1f8e4 for pr-143808
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] finished tweaking git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] tweaked toml for git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust on toolchain f8f6997469237299c1d60814c7b9828602a1f8e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f8f6997469237299c1d60814c7b9828602a1f8e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mesaverde0207/toy-c-compiler-in-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" "+f8f6997469237299c1d60814c7b9828602a1f8e4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+f8f6997469237299c1d60814c7b9828602a1f8e4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ecf1c51d0932a371685e50b76370aba4dc2dedf979e410d79784d98e94c8f313
[INFO] running `Command { std: "docker" "start" "-a" "ecf1c51d0932a371685e50b76370aba4dc2dedf979e410d79784d98e94c8f313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ecf1c51d0932a371685e50b76370aba4dc2dedf979e410d79784d98e94c8f313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ecf1c51d0932a371685e50b76370aba4dc2dedf979e410d79784d98e94c8f313", kill_on_drop: false }`
[INFO] [stdout] ecf1c51d0932a371685e50b76370aba4dc2dedf979e410d79784d98e94c8f313
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+f8f6997469237299c1d60814c7b9828602a1f8e4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c8ff964f06b9474326eb9ea9543a38faf19f1d0861c8f5ebc7a292182d92258e
[INFO] running `Command { std: "docker" "start" "-a" "c8ff964f06b9474326eb9ea9543a38faf19f1d0861c8f5ebc7a292182d92258e", kill_on_drop: false }`
[INFO] [stderr]     Checking toy-c-compiler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `tree` is never read
[INFO] [stdout]   --> src/tinyc/parser.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<'a> {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 52 |     lexer: Tokenizer<'a>,
[INFO] [stdout] 53 |     tree: Tree,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/tinyc/lexer.rs:108:40
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn new_empty(chars: PeekableString<'a>) -> Tokenizer {
[INFO] [stdout]     |                                        ^^      --------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                                        |
[INFO] [stdout]     |                                        this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn new_empty(chars: PeekableString<'a>) -> Tokenizer<'a> {
[INFO] [stdout]     |                                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `tree` is never read
[INFO] [stdout]   --> src/tinyc/parser.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<'a> {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 52 |     lexer: Tokenizer<'a>,
[INFO] [stdout] 53 |     tree: Tree,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/tinyc/lexer.rs:108:40
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn new_empty(chars: PeekableString<'a>) -> Tokenizer {
[INFO] [stdout]     |                                        ^^      --------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                                        |
[INFO] [stdout]     |                                        this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn new_empty(chars: PeekableString<'a>) -> Tokenizer<'a> {
[INFO] [stdout]     |                                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "c8ff964f06b9474326eb9ea9543a38faf19f1d0861c8f5ebc7a292182d92258e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8ff964f06b9474326eb9ea9543a38faf19f1d0861c8f5ebc7a292182d92258e", kill_on_drop: false }`
[INFO] [stdout] c8ff964f06b9474326eb9ea9543a38faf19f1d0861c8f5ebc7a292182d92258e