[INFO] fetching crate fqtk 0.3.1...
[INFO] testing fqtk-0.3.1 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate fqtk 0.3.1 into /workspace/builds/worker-0-tc1/source
[INFO] removed /workspace/builds/worker-0-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate fqtk 0.3.1
[INFO] finished tweaking crates.io crate fqtk 0.3.1
[INFO] tweaked toml for crates.io crate fqtk 0.3.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate fqtk 0.3.1 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate fqtk 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mimalloc v0.1.32
[INFO] [stderr]   Downloaded read-structure v0.1.0
[INFO] [stderr]   Downloaded proglog v0.3.0
[INFO] [stderr]   Downloaded seq_io v0.3.1
[INFO] [stderr]   Downloaded bgzf v0.2.0
[INFO] [stderr]   Downloaded fgoxide v0.3.0
[INFO] [stderr]   Downloaded libdeflater v0.7.5
[INFO] [stderr]   Downloaded pooled-writer v0.3.0
[INFO] [stderr]   Downloaded libdeflate-sys v0.7.5
[INFO] [stderr]   Downloaded bstr v1.1.0
[INFO] [stderr]   Downloaded libmimalloc-sys v0.1.28
[INFO] [stderr]   Downloaded libz-ng-sys v1.1.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c9dccdc2ed1a747343b59eff195ea9373c180a5e77d5310ea7c834c75697f83c
[INFO] running `Command { std: "docker" "start" "-a" "c9dccdc2ed1a747343b59eff195ea9373c180a5e77d5310ea7c834c75697f83c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c9dccdc2ed1a747343b59eff195ea9373c180a5e77d5310ea7c834c75697f83c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9dccdc2ed1a747343b59eff195ea9373c180a5e77d5310ea7c834c75697f83c", kill_on_drop: false }`
[INFO] [stdout] c9dccdc2ed1a747343b59eff195ea9373c180a5e77d5310ea7c834c75697f83c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a16bb052f81c8480004b203ba2a5b31f2c7424ea76c47d60b00b1dca94b2542f
[INFO] running `Command { std: "docker" "start" "-a" "a16bb052f81c8480004b203ba2a5b31f2c7424ea76c47d60b00b1dca94b2542f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling libc v0.2.138
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling cc v1.0.78
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]    Compiling crossbeam-utils v0.8.14
[INFO] [stderr]    Compiling semver v1.0.16
[INFO] [stderr]    Compiling futures-sink v0.3.25
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.49/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] [stderr]    Compiling memoffset v0.7.1
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]    Compiling thiserror v1.0.38
[INFO] [stderr]    Compiling futures-channel v0.3.25
[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" "a16bb052f81c8480004b203ba2a5b31f2c7424ea76c47d60b00b1dca94b2542f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a16bb052f81c8480004b203ba2a5b31f2c7424ea76c47d60b00b1dca94b2542f", kill_on_drop: false }`
[INFO] [stdout] a16bb052f81c8480004b203ba2a5b31f2c7424ea76c47d60b00b1dca94b2542f