[INFO] fetching crate unsynn 0.2.1...
[INFO] checking unsynn-0.2.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate unsynn 0.2.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate unsynn 0.2.1
[INFO] finished tweaking crates.io crate unsynn 0.2.1
[INFO] tweaked toml for crates.io crate unsynn 0.2.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate unsynn 0.2.1 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 unsynn 0.2.1 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] f1282b3cddb5613d5da7fbebb460264560bf7639da5debfa31632ea92549b1ec
[INFO] running `Command { std: "docker" "start" "-a" "f1282b3cddb5613d5da7fbebb460264560bf7639da5debfa31632ea92549b1ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f1282b3cddb5613d5da7fbebb460264560bf7639da5debfa31632ea92549b1ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1282b3cddb5613d5da7fbebb460264560bf7639da5debfa31632ea92549b1ec", kill_on_drop: false }`
[INFO] [stdout] f1282b3cddb5613d5da7fbebb460264560bf7639da5debfa31632ea92549b1ec
[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] f9af459a4651c57230eb6a130835c259a6004bb412d7d8e328a95dc63cf9bee3
[INFO] running `Command { std: "docker" "start" "-a" "f9af459a4651c57230eb6a130835c259a6004bb412d7d8e328a95dc63cf9bee3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]     Checking unicode-ident v1.0.20
[INFO] [stderr]    Compiling mutants v0.0.3
[INFO] [stderr]     Checking shadow_counted v0.4.0
[INFO] [stderr]     Checking rustc-hash v2.1.1
[INFO] [stderr]     Checking unsynn v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u128, Infallible>
[INFO] [stdout]   --> src/rust_types.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 |                     <$ty>::try_from(lit.second.value()).map_err(|e| Error::dynamic::<Self>(at, tokens, e))
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 | impl_unsigned_integer! {u8, u16, u32, u64, u128, usize}
[INFO] [stdout]    | ------------------------------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the macro `impl_unsigned_integer` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unsynn` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<u128, Infallible>
[INFO] [stdout]   --> src/rust_types.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 |                     <$ty>::try_from(lit.second.value()).map_err(|e| Error::dynamic::<Self>(at, tokens, e))
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 | impl_unsigned_integer! {u8, u16, u32, u64, u128, usize}
[INFO] [stdout]    | ------------------------------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the macro `impl_unsigned_integer` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unsynn` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "f9af459a4651c57230eb6a130835c259a6004bb412d7d8e328a95dc63cf9bee3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9af459a4651c57230eb6a130835c259a6004bb412d7d8e328a95dc63cf9bee3", kill_on_drop: false }`
[INFO] [stdout] f9af459a4651c57230eb6a130835c259a6004bb412d7d8e328a95dc63cf9bee3