[INFO] fetching crate qvnt 0.5.0-alpha...
[INFO] checking qvnt-0.5.0-alpha against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate qvnt 0.5.0-alpha into /workspace/builds/worker-7-tc2/source
[INFO] removed /workspace/builds/worker-7-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate qvnt 0.5.0-alpha
[INFO] finished tweaking crates.io crate qvnt 0.5.0-alpha
[INFO] tweaked toml for crates.io crate qvnt 0.5.0-alpha written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate qvnt 0.5.0-alpha 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] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 85 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.4.0 (available: v0.7.0)
[INFO] [stderr]       Adding float-cmp v0.9.0 (available: v0.10.0)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] [stderr]       Adding rand_distr v0.4.3 (available: v0.5.1)
[INFO] [stderr]       Adding test-case v2.2.2 (available: v3.3.1)
[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] 3f86f0cde0b369fcefb70da091b216ee71f2e635e8bc8146ae7c9e92e0b2da84
[INFO] running `Command { std: "docker" "start" "-a" "3f86f0cde0b369fcefb70da091b216ee71f2e635e8bc8146ae7c9e92e0b2da84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f86f0cde0b369fcefb70da091b216ee71f2e635e8bc8146ae7c9e92e0b2da84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f86f0cde0b369fcefb70da091b216ee71f2e635e8bc8146ae7c9e92e0b2da84", kill_on_drop: false }`
[INFO] [stdout] 3f86f0cde0b369fcefb70da091b216ee71f2e635e8bc8146ae7c9e92e0b2da84
[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] ef7c17ad3cafda38f48fbeadd6d9eee700e4dd2878d677afae1103fd9fed6775
[INFO] running `Command { std: "docker" "start" "-a" "ef7c17ad3cafda38f48fbeadd6d9eee700e4dd2878d677afae1103fd9fed6775", kill_on_drop: false }`
[INFO] [stderr]     Checking os_str_bytes v6.6.1
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]     Checking regex-automata v0.4.13
[INFO] [stderr]     Checking textwrap v0.16.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling zerocopy-derive v0.8.27
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling enum_dispatch v0.3.13
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]    Compiling test-case-macros v2.2.2
[INFO] [stderr]     Checking clap v3.2.25
[INFO] [stderr]     Checking test-case v2.2.2
[INFO] [stderr]     Checking num-complex v0.4.6
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking zerocopy v0.8.27
[INFO] [stderr]     Checking regex v1.12.2
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking half v2.7.1
[INFO] [stderr]     Checking ciborium-ll v0.2.2
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking ciborium v0.2.2
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking criterion v0.4.0
[INFO] [stderr]     Checking rand_distr v0.4.3
[INFO] [stderr]     Checking qvnt v0.5.0-alpha (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<BackendError, Infallible>
[INFO] [stdout]   --> src/backend/mod.rs:19:53
[INFO] [stdout]    |
[INFO] [stdout] 19 |       fn from_str(s: &str) -> Result<Self, Self::Err> {
[INFO] [stdout]    |  _____________________________________________________^
[INFO] [stdout] 20 | |         Ok(s.to_string().into())
[INFO] [stdout] 21 | |     }
[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<BackendError, Infallible>
[INFO] [stdout]   --> src/backend/mod.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Ok(s.to_string().into())
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `qvnt` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ef7c17ad3cafda38f48fbeadd6d9eee700e4dd2878d677afae1103fd9fed6775", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef7c17ad3cafda38f48fbeadd6d9eee700e4dd2878d677afae1103fd9fed6775", kill_on_drop: false }`
[INFO] [stdout] ef7c17ad3cafda38f48fbeadd6d9eee700e4dd2878d677afae1103fd9fed6775
