[INFO] fetching crate label-generator 0.3.0...
[INFO] checking label-generator-0.3.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate label-generator 0.3.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate label-generator 0.3.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate label-generator 0.3.0
[INFO] finished tweaking crates.io crate label-generator 0.3.0
[INFO] tweaked toml for crates.io crate label-generator 0.3.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate label-generator 0.3.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crossbeam-utils v0.8.6
[INFO] [stderr]   Downloaded memmap2 v0.5.2
[INFO] [stderr]   Downloaded fontdb v0.7.0
[INFO] [stderr]   Downloaded siphasher v0.3.9
[INFO] [stderr]   Downloaded bytemuck v1.7.3
[INFO] [stderr]   Downloaded ttf-parser v0.12.3
[INFO] [stderr]   Downloaded crossbeam-epoch v0.9.6
[INFO] [stderr]   Downloaded usvg v0.20.0
[INFO] [stderr]   Downloaded lua-src v544.0.0
[INFO] [stderr]   Downloaded luajit-src v210.3.2+resty1085a4d
[INFO] [stderr]   Downloaded rustybuzz v0.4.0
[INFO] [stderr]   Downloaded mlua v0.7.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9e8782da5afd05d7e7e4fb134d3816ff3f453be79d803f434d84401ee8c61e2d
[INFO] running `Command { std: "docker" "start" "-a" "9e8782da5afd05d7e7e4fb134d3816ff3f453be79d803f434d84401ee8c61e2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e8782da5afd05d7e7e4fb134d3816ff3f453be79d803f434d84401ee8c61e2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e8782da5afd05d7e7e4fb134d3816ff3f453be79d803f434d84401ee8c61e2d", kill_on_drop: false }`
[INFO] [stdout] 9e8782da5afd05d7e7e4fb134d3816ff3f453be79d803f434d84401ee8c61e2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da6aef2260592e6e81b19151c2e9ec316378c2d2a3e6879ff9d32674e3b7e48f
[INFO] running `Command { std: "docker" "start" "-a" "da6aef2260592e6e81b19151c2e9ec316378c2d2a3e6879ff9d32674e3b7e48f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.117
[INFO] [stderr]    Compiling crossbeam-utils v0.8.6
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.6
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling crc32fast v1.3.1
[INFO] [stderr]    Compiling unicode-general-category v0.4.0
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling luajit-src v210.3.2+resty1085a4d
[INFO] [stderr]    Compiling lua-src v544.0.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling pkg-config v0.3.24
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]     Checking ttf-parser v0.12.3
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking memmap2 v0.5.2
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling mlua v0.7.3
[INFO] [stderr]     Checking crossbeam-channel v0.5.2
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking xmlparser v0.13.3
[INFO] [stderr]     Checking unicode-bidi-mirroring v0.1.0
[INFO] [stderr]     Checking arrayvec v0.7.2
[INFO] [stderr]     Checking unicode-ccc v0.1.2
[INFO] [stderr]     Checking siphasher v0.3.9
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]     Checking bytemuck v1.7.3
[INFO] [stderr]    Compiling anyhow v1.0.53
[INFO] [stderr]     Checking unicode-script v0.5.4
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking svgtypes v0.8.0
[INFO] [stderr]     Checking data-url v0.1.1
[INFO] [stderr]     Checking fontdb v0.7.0
[INFO] [stderr]     Checking roxmltree v0.14.1
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]     Checking kurbo v0.8.3
[INFO] [stderr]     Checking rustybuzz v0.4.0
[INFO] [stderr]     Checking simplecss v0.2.1
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[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking xmlwriter v0.1.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking unicode-vo v0.1.0
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking pico-args v0.4.2
[INFO] [stderr]     Checking rctree v0.4.0
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking usvg v0.20.0
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking label-generator v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 48.87s
[INFO] running `Command { std: "docker" "inspect" "da6aef2260592e6e81b19151c2e9ec316378c2d2a3e6879ff9d32674e3b7e48f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da6aef2260592e6e81b19151c2e9ec316378c2d2a3e6879ff9d32674e3b7e48f", kill_on_drop: false }`
[INFO] [stdout] da6aef2260592e6e81b19151c2e9ec316378c2d2a3e6879ff9d32674e3b7e48f
[INFO] checking label-generator-0.3.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate label-generator 0.3.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate label-generator 0.3.0 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate label-generator 0.3.0
[INFO] finished tweaking crates.io crate label-generator 0.3.0
[INFO] tweaked toml for crates.io crate label-generator 0.3.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate label-generator 0.3.0 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7b8b42eaff70d5c2d177e0c7f9db230b05c9b60227a586d7a321f49c8b1b093
[INFO] running `Command { std: "docker" "start" "-a" "a7b8b42eaff70d5c2d177e0c7f9db230b05c9b60227a586d7a321f49c8b1b093", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7b8b42eaff70d5c2d177e0c7f9db230b05c9b60227a586d7a321f49c8b1b093", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7b8b42eaff70d5c2d177e0c7f9db230b05c9b60227a586d7a321f49c8b1b093", kill_on_drop: false }`
[INFO] [stdout] a7b8b42eaff70d5c2d177e0c7f9db230b05c9b60227a586d7a321f49c8b1b093
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5a05239a2df49821b991b1c83597a79ddc3a68fe935e621830e326447f98ea30
[INFO] running `Command { std: "docker" "start" "-a" "5a05239a2df49821b991b1c83597a79ddc3a68fe935e621830e326447f98ea30", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.117
[INFO] [stderr]    Compiling crossbeam-utils v0.8.6
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.6
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling crc32fast v1.3.1
[INFO] [stderr]    Compiling unicode-general-category v0.4.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling luajit-src v210.3.2+resty1085a4d
[INFO] [stderr]    Compiling lua-src v544.0.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]     Checking ttf-parser v0.12.3
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling pkg-config v0.3.24
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking memmap2 v0.5.2
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]     Checking crossbeam-channel v0.5.2
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling mlua v0.7.3
[INFO] [stderr]     Checking unicode-bidi-mirroring v0.1.0
[INFO] [stderr]    Compiling anyhow v1.0.53
[INFO] [stderr]     Checking xmlparser v0.13.3
[INFO] [stderr]     Checking bytemuck v1.7.3
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]     Checking unicode-ccc v0.1.2
[INFO] [stderr]     Checking unicode-script v0.5.4
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking arrayvec v0.7.2
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]     Checking siphasher v0.3.9
[INFO] [stderr]     Checking data-url v0.1.1
[INFO] [stderr]     Checking svgtypes v0.8.0
[INFO] [stderr]     Checking roxmltree v0.14.1
[INFO] [stderr]     Checking kurbo v0.8.3
[INFO] [stderr]     Checking fontdb v0.7.0
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]     Checking rustybuzz v0.4.0
[INFO] [stderr]     Checking simplecss v0.2.1
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking once_cell v1.9.0
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking xmlwriter v0.1.0
[INFO] [stderr]     Checking rctree v0.4.0
[INFO] [stderr]     Checking unicode-vo v0.1.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking pico-args v0.4.2
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking usvg v0.20.0
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stdout] error[E0277]: the trait bound `!: FromLuaMulti<'_>` is not satisfied
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mlua-0.7.3/src/lua.rs:2655:14
[INFO] [stdout]      |
[INFO] [stdout] 2655 |         self.call(())?;
[INFO] [stdout]      |              ^^^^ the trait `UserData` is not implemented for `!`, which is required by `!: FromLuaMulti<'_>`
[INFO] [stdout]      |
[INFO] [stdout]      = help: the following other types implement trait `FromLuaMulti<'lua>`:
[INFO] [stdout]                ()
[INFO] [stdout]                (A,)
[INFO] [stdout]                (B, A)
[INFO] [stdout]                (B, C, A)
[INFO] [stdout]                (B, C, D, A)
[INFO] [stdout]                (B, C, D, E, A)
[INFO] [stdout]                (B, C, D, E, F, A)
[INFO] [stdout]                (B, C, D, E, F, G, A)
[INFO] [stdout]              and 11 others
[INFO] [stdout] note: required for `!` to implement `FromLua<'_>`
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mlua-0.7.3/src/conversion.rs:148:43
[INFO] [stdout]      |
[INFO] [stdout] 148  | impl<'lua, T: 'static + UserData + Clone> FromLua<'lua> for T {
[INFO] [stdout]      |                         --------          ^^^^^^^^^^^^^     ^
[INFO] [stdout]      |                         |
[INFO] [stdout]      |                         unsatisfied trait bound introduced here
[INFO] [stdout] note: required for `!` to implement `FromLuaMulti<'_>`
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mlua-0.7.3/src/multi.rs:35:30
[INFO] [stdout]      |
[INFO] [stdout] 35   | impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for T {
[INFO] [stdout]      |               -------------  ^^^^^^^^^^^^^^^^^^     ^
[INFO] [stdout]      |               |
[INFO] [stdout]      |               unsatisfied trait bound introduced here
[INFO] [stdout] note: required by a bound in `Chunk::<'lua, 'a>::call`
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/mlua-0.7.3/src/lua.rs:2733:41
[INFO] [stdout]      |
[INFO] [stdout] 2733 |     pub fn call<A: ToLuaMulti<'lua>, R: FromLuaMulti<'lua>>(self, args: A) -> Result<R> {
[INFO] [stdout]      |                                         ^^^^^^^^^^^^^^^^^^ required by this bound in `Chunk::<'lua, 'a>::call`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mlua` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "5a05239a2df49821b991b1c83597a79ddc3a68fe935e621830e326447f98ea30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a05239a2df49821b991b1c83597a79ddc3a68fe935e621830e326447f98ea30", kill_on_drop: false }`
[INFO] [stdout] 5a05239a2df49821b991b1c83597a79ddc3a68fe935e621830e326447f98ea30