[INFO] fetching crate mayheap 0.2.0...
[INFO] checking mayheap-0.2.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate mayheap 0.2.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate mayheap 0.2.0
[INFO] finished tweaking crates.io crate mayheap 0.2.0
[INFO] tweaked toml for crates.io crate mayheap 0.2.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mayheap 0.2.0 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 crates.io crate mayheap 0.2.0 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] cef5e8a45dda190184a0886425ef037abdf10867e385315a10a363dad73808fc
[INFO] running `Command { std: "docker" "start" "-a" "cef5e8a45dda190184a0886425ef037abdf10867e385315a10a363dad73808fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cef5e8a45dda190184a0886425ef037abdf10867e385315a10a363dad73808fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cef5e8a45dda190184a0886425ef037abdf10867e385315a10a363dad73808fc", kill_on_drop: false }`
[INFO] [stdout] cef5e8a45dda190184a0886425ef037abdf10867e385315a10a363dad73808fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] d858eae0cc3d8dbaaac0b9e12c71518e1e38b95ea6fcf997f70802a606c5b4c0
[INFO] running `Command { std: "docker" "start" "-a" "d858eae0cc3d8dbaaac0b9e12c71518e1e38b95ea6fcf997f70802a606c5b4c0", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]     Checking mayheap v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: core::result::Result<string::String<N>, Infallible>
[INFO] [stdout]    --> src/string.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 | /         Inner::from_str(s)
[INFO] [stdout] 194 | |             .map(Self)
[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: core::result::Result<alloc::string::String, Infallible>
[INFO] [stdout]    --> src/string.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |         Inner::from_str(s)
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mayheap` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "d858eae0cc3d8dbaaac0b9e12c71518e1e38b95ea6fcf997f70802a606c5b4c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d858eae0cc3d8dbaaac0b9e12c71518e1e38b95ea6fcf997f70802a606c5b4c0", kill_on_drop: false }`
[INFO] [stdout] d858eae0cc3d8dbaaac0b9e12c71518e1e38b95ea6fcf997f70802a606c5b4c0