[INFO] fetching crate flex-page 2.1.0...
[INFO] checking flex-page-2.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate flex-page 2.1.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate flex-page 2.1.0
[INFO] finished tweaking crates.io crate flex-page 2.1.0
[INFO] tweaked toml for crates.io crate flex-page 2.1.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate flex-page 2.1.0 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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] 2a7a79e1636b9ac7a5f27f0226a3734a66cd9bc5f26f409cdf6bc98a61189a0b
[INFO] running `Command { std: "docker" "start" "-a" "2a7a79e1636b9ac7a5f27f0226a3734a66cd9bc5f26f409cdf6bc98a61189a0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a7a79e1636b9ac7a5f27f0226a3734a66cd9bc5f26f409cdf6bc98a61189a0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a7a79e1636b9ac7a5f27f0226a3734a66cd9bc5f26f409cdf6bc98a61189a0b", kill_on_drop: false }`
[INFO] [stdout] 2a7a79e1636b9ac7a5f27f0226a3734a66cd9bc5f26f409cdf6bc98a61189a0b
[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] 45933a87d301803f7879b42af1028daa2d3dcc5683aa32037d3612cbe8476571
[INFO] running `Command { std: "docker" "start" "-a" "45933a87d301803f7879b42af1028daa2d3dcc5683aa32037d3612cbe8476571", kill_on_drop: false }`
[INFO] [stderr]     Checking flex-page v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<u32, Infallible>
[INFO] [stdout]   --> src/page_no.rs:19:40
[INFO] [stdout]    |
[INFO] [stdout] 19 |             fn new(num: u32) -> Self { num.try_into().unwrap() }
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 | impl_trait!(PageNo for u8:1 u16:2 u32:4);
[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_trait` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flex-page` (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: Result<u32, Infallible>
[INFO] [stdout]   --> src/page_no.rs:19:40
[INFO] [stdout]    |
[INFO] [stdout] 19 |             fn new(num: u32) -> Self { num.try_into().unwrap() }
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 | impl_trait!(PageNo for u8:1 u16:2 u32:4);
[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_trait` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flex-page` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "45933a87d301803f7879b42af1028daa2d3dcc5683aa32037d3612cbe8476571", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45933a87d301803f7879b42af1028daa2d3dcc5683aa32037d3612cbe8476571", kill_on_drop: false }`
[INFO] [stdout] 45933a87d301803f7879b42af1028daa2d3dcc5683aa32037d3612cbe8476571