[INFO] cloning repository https://github.com/leonardo-toffalini/lexer-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/leonardo-toffalini/lexer-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleonardo-toffalini%2Flexer-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleonardo-toffalini%2Flexer-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0dd14c3e6a0f747f33c753fa51d9c8dd10aec089
[INFO] checking leonardo-toffalini/lexer-rs against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleonardo-toffalini%2Flexer-rs" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/leonardo-toffalini/lexer-rs
[INFO] finished tweaking git repo https://github.com/leonardo-toffalini/lexer-rs
[INFO] tweaked toml for git repo https://github.com/leonardo-toffalini/lexer-rs written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/leonardo-toffalini/lexer-rs on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/leonardo-toffalini/lexer-rs 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3dafa78ce46531aee207551dfe2b051412ea69164de7423acb298a05a14911e5
[INFO] running `Command { std: "docker" "start" "-a" "3dafa78ce46531aee207551dfe2b051412ea69164de7423acb298a05a14911e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3dafa78ce46531aee207551dfe2b051412ea69164de7423acb298a05a14911e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3dafa78ce46531aee207551dfe2b051412ea69164de7423acb298a05a14911e5", kill_on_drop: false }`
[INFO] [stdout] 3dafa78ce46531aee207551dfe2b051412ea69164de7423acb298a05a14911e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3aaf4f5f4c9d3d0411568b49f342b04a66e4b00bd854b08465d815fe1c355ca4
[INFO] running `Command { std: "docker" "start" "-a" "3aaf4f5f4c9d3d0411568b49f342b04a66e4b00bd854b08465d815fe1c355ca4", kill_on_drop: false }`
[INFO] [stderr]     Checking lexer-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/parser.rs:258:26
[INFO] [stdout]     |
[INFO] [stdout] 258 |           let string_lit = self
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 259 | |             .cur_token
[INFO] [stdout] 260 | |             .literal
[INFO] [stdout] 261 | |             .clone()
[INFO] [stdout] 262 | |             .parse::<String>()
[INFO] [stdout]     | |______________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lexer-rs` (bin "lexer-rs" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/parser.rs:258:26
[INFO] [stdout]     |
[INFO] [stdout] 258 |           let string_lit = self
[INFO] [stdout]     |  __________________________^
[INFO] [stdout] 259 | |             .cur_token
[INFO] [stdout] 260 | |             .literal
[INFO] [stdout] 261 | |             .clone()
[INFO] [stdout] 262 | |             .parse::<String>()
[INFO] [stdout]     | |______________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lexer-rs` (bin "lexer-rs") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "3aaf4f5f4c9d3d0411568b49f342b04a66e4b00bd854b08465d815fe1c355ca4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3aaf4f5f4c9d3d0411568b49f342b04a66e4b00bd854b08465d815fe1c355ca4", kill_on_drop: false }`
[INFO] [stdout] 3aaf4f5f4c9d3d0411568b49f342b04a66e4b00bd854b08465d815fe1c355ca4