[INFO] fetching crate muzzman-daemon 0.0.8...
[INFO] checking muzzman-daemon-0.0.8 against try#1f308f12738d8cc40bb23bf0c8114b37c164bb49 for pr-137268
[INFO] extracting crate muzzman-daemon 0.0.8 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate muzzman-daemon 0.0.8 on toolchain 1f308f12738d8cc40bb23bf0c8114b37c164bb49
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f308f12738d8cc40bb23bf0c8114b37c164bb49" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate muzzman-daemon 0.0.8
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate muzzman-daemon 0.0.8
[INFO] tweaked toml for crates.io crate muzzman-daemon 0.0.8 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate muzzman-daemon 0.0.8 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" "+1f308f12738d8cc40bb23bf0c8114b37c164bb49" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded muzzman-lib-macros v0.1.3
[INFO] [stderr]   Downloaded bytes-kman-derive v0.1.5
[INFO] [stderr]   Downloaded muzzman-lib v0.3.5
[INFO] [stderr]   Downloaded get_ref v0.1.0
[INFO] [stderr]   Downloaded bytes-kman v0.1.19
[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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1f308f12738d8cc40bb23bf0c8114b37c164bb49" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fb6f1910aabb200156004ce19de51a3f6f6bc810e221e0c0d64c1c967218ca6c
[INFO] running `Command { std: "docker" "start" "-a" "fb6f1910aabb200156004ce19de51a3f6f6bc810e221e0c0d64c1c967218ca6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb6f1910aabb200156004ce19de51a3f6f6bc810e221e0c0d64c1c967218ca6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb6f1910aabb200156004ce19de51a3f6f6bc810e221e0c0d64c1c967218ca6c", kill_on_drop: false }`
[INFO] [stdout] fb6f1910aabb200156004ce19de51a3f6f6bc810e221e0c0d64c1c967218ca6c
[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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+1f308f12738d8cc40bb23bf0c8114b37c164bb49" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a8621343fc4be957188e9a23df25d930f647f043d28e28df1ccd479e3d907329
[INFO] running `Command { std: "docker" "start" "-a" "a8621343fc4be957188e9a23df25d930f647f043d28e28df1ccd479e3d907329", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]     Checking get_ref v0.1.0
[INFO] [stderr]     Checking libloading v0.7.4
[INFO] [stderr]    Compiling polling v2.5.2
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.51/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] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "a8621343fc4be957188e9a23df25d930f647f043d28e28df1ccd479e3d907329", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8621343fc4be957188e9a23df25d930f647f043d28e28df1ccd479e3d907329", kill_on_drop: false }`
[INFO] [stdout] a8621343fc4be957188e9a23df25d930f647f043d28e28df1ccd479e3d907329