[INFO] fetching crate stackstring 0.3.1...
[INFO] checking stackstring-0.3.1 against master#506512391b1a75ae450d36c9420978402a91abcc for pr-125384
[INFO] extracting crate stackstring 0.3.1 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate stackstring 0.3.1 on toolchain 506512391b1a75ae450d36c9420978402a91abcc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate stackstring 0.3.1
[INFO] finished tweaking crates.io crate stackstring 0.3.1
[INFO] tweaked toml for crates.io crate stackstring 0.3.1 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate stackstring 0.3.1 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" "+506512391b1a75ae450d36c9420978402a91abcc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rkyv_derive v0.7.39
[INFO] [stderr]   Downloaded bytecheck_derive v0.6.9
[INFO] [stderr]   Downloaded bytecheck v0.6.9
[INFO] [stderr]   Downloaded rend v0.3.6
[INFO] [stderr]   Downloaded rkyv v0.7.39
[INFO] [stderr]   Downloaded serde_derive v1.0.149
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 36e8aac3b001625e505156562bc8b300f95bcac91bfde406f459a53303444398
[INFO] running `Command { std: "docker" "start" "-a" "36e8aac3b001625e505156562bc8b300f95bcac91bfde406f459a53303444398", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "36e8aac3b001625e505156562bc8b300f95bcac91bfde406f459a53303444398", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36e8aac3b001625e505156562bc8b300f95bcac91bfde406f459a53303444398", kill_on_drop: false }`
[INFO] [stdout] 36e8aac3b001625e505156562bc8b300f95bcac91bfde406f459a53303444398
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0c1aa4033539616eb8363407989b235de41c3b551d073a52806aaee5bbd8323
[INFO] running `Command { std: "docker" "start" "-a" "e0c1aa4033539616eb8363407989b235de41c3b551d073a52806aaee5bbd8323", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.105
[INFO] [stderr]    Compiling serde_derive v1.0.149
[INFO] [stderr]    Compiling serde v1.0.149
[INFO] [stderr]    Compiling serde_json v1.0.89
[INFO] [stderr]     Checking itoa v1.0.4
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking stackstring v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.47/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[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 E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "e0c1aa4033539616eb8363407989b235de41c3b551d073a52806aaee5bbd8323", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0c1aa4033539616eb8363407989b235de41c3b551d073a52806aaee5bbd8323", kill_on_drop: false }`
[INFO] [stdout] e0c1aa4033539616eb8363407989b235de41c3b551d073a52806aaee5bbd8323
[INFO] checking stackstring-0.3.1 against try#dae34b759e282c069aa28752564694effd121a63 for pr-125384
[INFO] extracting crate stackstring 0.3.1 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate stackstring 0.3.1 on toolchain dae34b759e282c069aa28752564694effd121a63
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate stackstring 0.3.1
[INFO] finished tweaking crates.io crate stackstring 0.3.1
[INFO] tweaked toml for crates.io crate stackstring 0.3.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate crates.io crate stackstring 0.3.1 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" "+dae34b759e282c069aa28752564694effd121a63" "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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b8b3ef2d0421138d8c781d60d488bd1ac43e788be083fdcc120a332c51ebef35
[INFO] running `Command { std: "docker" "start" "-a" "b8b3ef2d0421138d8c781d60d488bd1ac43e788be083fdcc120a332c51ebef35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8b3ef2d0421138d8c781d60d488bd1ac43e788be083fdcc120a332c51ebef35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8b3ef2d0421138d8c781d60d488bd1ac43e788be083fdcc120a332c51ebef35", kill_on_drop: false }`
[INFO] [stdout] b8b3ef2d0421138d8c781d60d488bd1ac43e788be083fdcc120a332c51ebef35
[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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+dae34b759e282c069aa28752564694effd121a63" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de3f51407504af43004ef7a9ff716ae68fc5b3ccc26da0d3e4cf139b0d4ec45d
[INFO] running `Command { std: "docker" "start" "-a" "de3f51407504af43004ef7a9ff716ae68fc5b3ccc26da0d3e4cf139b0d4ec45d", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] skipping non-2021 edition `2018`
[INFO] running `Command { std: "docker" "inspect" "de3f51407504af43004ef7a9ff716ae68fc5b3ccc26da0d3e4cf139b0d4ec45d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de3f51407504af43004ef7a9ff716ae68fc5b3ccc26da0d3e4cf139b0d4ec45d", kill_on_drop: false }`
[INFO] [stdout] de3f51407504af43004ef7a9ff716ae68fc5b3ccc26da0d3e4cf139b0d4ec45d