[INFO] fetching crate ac-library-rs 0.2.0...
[INFO] checking ac-library-rs-0.2.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate ac-library-rs 0.2.0 into /workspace/builds/worker-2-tc2/source
[INFO] removed /workspace/builds/worker-2-tc2/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-2-tc2/source/rust-toolchain
[INFO] started tweaking crates.io crate ac-library-rs 0.2.0
[INFO] finished tweaking crates.io crate ac-library-rs 0.2.0
[INFO] tweaked toml for crates.io crate ac-library-rs 0.2.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ac-library-rs 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 ac-library-rs 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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 2097f984509b2c0458bbcce2eadf4a36e48c4ef8f48eeb40cb201a948bb13c17
[INFO] running `Command { std: "docker" "start" "-a" "2097f984509b2c0458bbcce2eadf4a36e48c4ef8f48eeb40cb201a948bb13c17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2097f984509b2c0458bbcce2eadf4a36e48c4ef8f48eeb40cb201a948bb13c17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2097f984509b2c0458bbcce2eadf4a36e48c4ef8f48eeb40cb201a948bb13c17", kill_on_drop: false }`
[INFO] [stdout] 2097f984509b2c0458bbcce2eadf4a36e48c4ef8f48eeb40cb201a948bb13c17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 96f9c79a936b4a5db6063fec9446547c72f601b3c4563abd0d19e303582be49a
[INFO] running `Command { std: "docker" "start" "-a" "96f9c79a936b4a5db6063fec9446547c72f601b3c4563abd0d19e303582be49a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking ac-library-rs v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking proconio v0.3.6
[INFO] [stdout] error: this type will no longer be must used: Result<StaticModInt<M>, Infallible>
[INFO] [stdout]    --> src/modint.rs:849:62
[INFO] [stdout]     |
[INFO] [stdout] 849 |               fn from_str(s: &str) -> Result<Self, Infallible> {
[INFO] [stdout]     |  ______________________________________________________________^
[INFO] [stdout] 850 | |                 Self::from_str_impl(s)
[INFO] [stdout] 851 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] ...
[INFO] [stdout] 905 | / impl_basic_traits! {
[INFO] [stdout] 906 | |     impl <M: Modulus> _ for StaticModInt<M> ;
[INFO] [stdout] 907 | |     impl <I: Id     > _ for DynamicModInt<I>;
[INFO] [stdout] 908 | | }
[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_basic_traits` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<StaticModInt<M>, Infallible>
[INFO] [stdout]    --> src/modint.rs:850:17
[INFO] [stdout]     |
[INFO] [stdout] 850 |                   Self::from_str_impl(s)
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 905 | / impl_basic_traits! {
[INFO] [stdout] 906 | |     impl <M: Modulus> _ for StaticModInt<M> ;
[INFO] [stdout] 907 | |     impl <I: Id     > _ for DynamicModInt<I>;
[INFO] [stdout] 908 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_basic_traits` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DynamicModInt<I>, Infallible>
[INFO] [stdout]    --> src/modint.rs:849:62
[INFO] [stdout]     |
[INFO] [stdout] 849 |               fn from_str(s: &str) -> Result<Self, Infallible> {
[INFO] [stdout]     |  ______________________________________________________________^
[INFO] [stdout] 850 | |                 Self::from_str_impl(s)
[INFO] [stdout] 851 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] ...
[INFO] [stdout] 905 | / impl_basic_traits! {
[INFO] [stdout] 906 | |     impl <M: Modulus> _ for StaticModInt<M> ;
[INFO] [stdout] 907 | |     impl <I: Id     > _ for DynamicModInt<I>;
[INFO] [stdout] 908 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_basic_traits` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DynamicModInt<I>, Infallible>
[INFO] [stdout]    --> src/modint.rs:850:17
[INFO] [stdout]     |
[INFO] [stdout] 850 |                   Self::from_str_impl(s)
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 905 | / impl_basic_traits! {
[INFO] [stdout] 906 | |     impl <M: Modulus> _ for StaticModInt<M> ;
[INFO] [stdout] 907 | |     impl <I: Id     > _ for DynamicModInt<I>;
[INFO] [stdout] 908 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_basic_traits` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ac-library-rs` (lib) due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "96f9c79a936b4a5db6063fec9446547c72f601b3c4563abd0d19e303582be49a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96f9c79a936b4a5db6063fec9446547c72f601b3c4563abd0d19e303582be49a", kill_on_drop: false }`
[INFO] [stdout] 96f9c79a936b4a5db6063fec9446547c72f601b3c4563abd0d19e303582be49a