[INFO] cloning repository https://github.com/o-in25/iron
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/o-in25/iron" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fo-in25%2Firon", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fo-in25%2Firon'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ea70423ca4eeaaf8155a552eb48445ced2fe7898
[INFO] checking o-in25/iron against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fo-in25%2Firon" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/o-in25/iron on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/o-in25/iron
[INFO] finished tweaking git repo https://github.com/o-in25/iron
[INFO] tweaked toml for git repo https://github.com/o-in25/iron written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/o-in25/iron 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded stacktrace v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a3d44146ede446c0566ae1992ca2f215bac8a86e4cf8762ee23cb1bff0e1d988
[INFO] running `Command { std: "docker" "start" "-a" "a3d44146ede446c0566ae1992ca2f215bac8a86e4cf8762ee23cb1bff0e1d988", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3d44146ede446c0566ae1992ca2f215bac8a86e4cf8762ee23cb1bff0e1d988", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3d44146ede446c0566ae1992ca2f215bac8a86e4cf8762ee23cb1bff0e1d988", kill_on_drop: false }`
[INFO] [stdout] a3d44146ede446c0566ae1992ca2f215bac8a86e4cf8762ee23cb1bff0e1d988
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2b71d2309a6a65caeb2c9bced9dd30aad64ed4a389adf4c02250f0314e83e166
[INFO] running `Command { std: "docker" "start" "-a" "2b71d2309a6a65caeb2c9bced9dd30aad64ed4a389adf4c02250f0314e83e166", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling cc v1.0.40
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking regex-syntax v0.6.11
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]     Checking regex v1.2.1
[INFO] [stderr]     Checking stacktrace v0.2.1
[INFO] [stderr]     Checking iron v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `regex::Regex`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use regex::Regex;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Vec` is imported redundantly
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::vec::Vec;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Vec` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::vec::Vec`
[INFO] [stdout]  --> src/lexer.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::vec::Vec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `regex::Regex`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use regex::Regex;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Vec` is imported redundantly
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::vec::Vec;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Vec` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::vec::Vec`
[INFO] [stdout]  --> src/lexer.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::vec::Vec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/lexer.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum NameT {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 11 |     OpenBrace,
[INFO] [stdout] 12 |     CloseBrace,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 13 |     OpenParenthesis,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 14 |     CloseParenthesis,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 15 |     Semicolon,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 16 |     IntegerKeyword,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 17 |     ReturnKeyword,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 18 |     Identifier,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 19 |     IntegerLiteral
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `value` are never read
[INFO] [stdout]   --> src/lexer.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct TokenT<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 23 |     name: NameT,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 24 |     value: &'a str
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/lexer.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum NameT {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 11 |     OpenBrace,
[INFO] [stdout] 12 |     CloseBrace,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 13 |     OpenParenthesis,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 14 |     CloseParenthesis,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 15 |     Semicolon,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 16 |     IntegerKeyword,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 17 |     ReturnKeyword,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 18 |     Identifier,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 19 |     IntegerLiteral
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `value` are never read
[INFO] [stdout]   --> src/lexer.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct TokenT<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 23 |     name: NameT,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 24 |     value: &'a str
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.94s
[INFO] running `Command { std: "docker" "inspect" "2b71d2309a6a65caeb2c9bced9dd30aad64ed4a389adf4c02250f0314e83e166", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b71d2309a6a65caeb2c9bced9dd30aad64ed4a389adf4c02250f0314e83e166", kill_on_drop: false }`
[INFO] [stdout] 2b71d2309a6a65caeb2c9bced9dd30aad64ed4a389adf4c02250f0314e83e166