[INFO] cloning repository https://github.com/pro465/lam
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pro465/lam" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpro465%2Flam", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpro465%2Flam'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c51caf7de5bba891706be02457ab9ef4722535a1
[INFO] checking pro465/lam 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%2Fpro465%2Flam" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/pro465/lam
[INFO] finished tweaking git repo https://github.com/pro465/lam
[INFO] tweaked toml for git repo https://github.com/pro465/lam written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/pro465/lam 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/pro465/lam 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 341b9f59f84d8ac4360a74b428011316ee13066d6454ed403fbbc631a323f242
[INFO] running `Command { std: "docker" "start" "-a" "341b9f59f84d8ac4360a74b428011316ee13066d6454ed403fbbc631a323f242", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "341b9f59f84d8ac4360a74b428011316ee13066d6454ed403fbbc631a323f242", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "341b9f59f84d8ac4360a74b428011316ee13066d6454ed403fbbc631a323f242", kill_on_drop: false }`
[INFO] [stdout] 341b9f59f84d8ac4360a74b428011316ee13066d6454ed403fbbc631a323f242
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 54bcd4b1e04bc40bd4764ee92653ddb3d1c5dd323afb282d3d86e2387adf8a66
[INFO] running `Command { std: "docker" "start" "-a" "54bcd4b1e04bc40bd4764ee92653ddb3d1c5dd323afb282d3d86e2387adf8a66", kill_on_drop: false }`
[INFO] [stderr]     Checking lam v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/p1.rs:41:25
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut s: String = (first as char).try_into().unwrap();
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<char, Infallible>
[INFO] [stdout]   --> src/p1.rs:47:16
[INFO] [stdout]    |
[INFO] [stdout] 47 |         s.push(x.try_into().unwrap());
[INFO] [stdout]    |                ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/p1.rs:41:25
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut s: String = (first as char).try_into().unwrap();
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<char, Infallible>
[INFO] [stdout]   --> src/p1.rs:47:16
[INFO] [stdout]    |
[INFO] [stdout] 47 |         s.push(x.try_into().unwrap());
[INFO] [stdout]    |                ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lam` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `lam` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "54bcd4b1e04bc40bd4764ee92653ddb3d1c5dd323afb282d3d86e2387adf8a66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54bcd4b1e04bc40bd4764ee92653ddb3d1c5dd323afb282d3d86e2387adf8a66", kill_on_drop: false }`
[INFO] [stdout] 54bcd4b1e04bc40bd4764ee92653ddb3d1c5dd323afb282d3d86e2387adf8a66