[INFO] fetching crate morkovmap_rc 0.4.1...
[INFO] checking morkovmap_rc-0.4.1 against master#8c32e313cccf7df531e2d49ffb8227bb92304aee for pr-145608-1
[INFO] extracting crate morkovmap_rc 0.4.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate morkovmap_rc 0.4.1
[INFO] finished tweaking crates.io crate morkovmap_rc 0.4.1
[INFO] tweaked toml for crates.io crate morkovmap_rc 0.4.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate morkovmap_rc 0.4.1 on toolchain 8c32e313cccf7df531e2d49ffb8227bb92304aee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate morkovmap_rc 0.4.1 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" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "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 num v0.4.0
[INFO] [stderr]   Downloaded jpeg-encoder v0.5.1
[INFO] [stderr]   Downloaded proc-macro2 v1.0.55
[INFO] [stderr]   Downloaded colorgrad v0.6.2
[INFO] [stderr]   Downloaded fontdue v0.7.2
[INFO] [stderr]   Downloaded fast_image_resize v2.7.0
[INFO] [stderr]   Downloaded libwebp-sys2 v0.1.7
[INFO] [stderr]   Downloaded ril v0.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 776f8af0775821dc2ff9d6341d4faf0fb358a2d51f2d1adad1c74e60ee5f0b4b
[INFO] running `Command { std: "docker" "start" "-a" "776f8af0775821dc2ff9d6341d4faf0fb358a2d51f2d1adad1c74e60ee5f0b4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "776f8af0775821dc2ff9d6341d4faf0fb358a2d51f2d1adad1c74e60ee5f0b4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "776f8af0775821dc2ff9d6341d4faf0fb358a2d51f2d1adad1c74e60ee5f0b4b", kill_on_drop: false }`
[INFO] [stdout] 776f8af0775821dc2ff9d6341d4faf0fb358a2d51f2d1adad1c74e60ee5f0b4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dd8c239b2f745021e8716933f657e916c8c08d78befa40137c30083a10e0464c
[INFO] running `Command { std: "docker" "start" "-a" "dd8c239b2f745021e8716933f657e916c8c08d78befa40137c30083a10e0464c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling proc-macro2 v1.0.55
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]     Checking once_cell v1.17.1
[INFO] [stderr]     Checking either v1.8.1
[INFO] [stderr]    Compiling serde v1.0.159
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling libwebp-sys2 v0.1.7
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stderr]    Compiling serde_json v1.0.95
[INFO] [stderr]     Checking csscolorparser v0.6.2
[INFO] [stderr]     Checking ttf-parser v0.15.2
[INFO] [stderr]     Checking num-complex v0.4.3
[INFO] [stderr]     Checking gif v0.12.0
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking colorgrad v0.6.2
[INFO] [stderr]     Checking jpeg-encoder v0.5.1
[INFO] [stderr]     Checking arrayvec v0.7.2
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.55/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]     Checking flate2 v1.0.25
[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" "dd8c239b2f745021e8716933f657e916c8c08d78befa40137c30083a10e0464c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd8c239b2f745021e8716933f657e916c8c08d78befa40137c30083a10e0464c", kill_on_drop: false }`
[INFO] [stdout] dd8c239b2f745021e8716933f657e916c8c08d78befa40137c30083a10e0464c