[INFO] fetching crate alkali 0.3.0...
[INFO] checking alkali-0.3.0 against master#b286722878e18db29a7fbe672be7c4d3b02e8e4d for pr-127655
[INFO] extracting crate alkali 0.3.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate alkali 0.3.0 on toolchain b286722878e18db29a7fbe672be7c4d3b02e8e4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b286722878e18db29a7fbe672be7c4d3b02e8e4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate alkali 0.3.0
[INFO] finished tweaking crates.io crate alkali 0.3.0
[INFO] tweaked toml for crates.io crate alkali 0.3.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate alkali 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" "+b286722878e18db29a7fbe672be7c4d3b02e8e4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rtoolbox v0.0.1
[INFO] [stderr]   Downloaded rpassword v7.2.0
[INFO] [stderr]   Downloaded crossbeam-utils v0.8.14
[INFO] [stderr]   Downloaded zip v0.6.4
[INFO] [stderr]   Downloaded adler32 v1.2.0
[INFO] [stderr]   Downloaded libflate_lz77 v1.2.0
[INFO] [stderr]   Downloaded filetime v0.2.20
[INFO] [stderr]   Downloaded xattr v0.2.3
[INFO] [stderr]   Downloaded minisign-verify v0.2.1
[INFO] [stderr]   Downloaded rle-decode-fast v1.0.3
[INFO] [stderr]   Downloaded ureq v2.6.2
[INFO] [stderr]   Downloaded libflate v1.3.0
[INFO] [stderr]   Downloaded tar v0.4.38
[INFO] [stderr]   Downloaded webpki v0.22.0
[INFO] [stderr]   Downloaded rustls v0.20.8
[INFO] [stderr]   Downloaded libsodium-sys-stable v1.19.27
[INFO] [stderr]   Downloaded serde-big-array v0.5.0
[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+b286722878e18db29a7fbe672be7c4d3b02e8e4d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 77c878e09b5727da336b5a64ee767be245f4e57fe84b2a61734fb5256a31d5a6
[INFO] running `Command { std: "docker" "start" "-a" "77c878e09b5727da336b5a64ee767be245f4e57fe84b2a61734fb5256a31d5a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77c878e09b5727da336b5a64ee767be245f4e57fe84b2a61734fb5256a31d5a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77c878e09b5727da336b5a64ee767be245f4e57fe84b2a61734fb5256a31d5a6", kill_on_drop: false }`
[INFO] [stdout] 77c878e09b5727da336b5a64ee767be245f4e57fe84b2a61734fb5256a31d5a6
[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+b286722878e18db29a7fbe672be7c4d3b02e8e4d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cb077001b8d3e6c5405ef16bc6997685f52b7087c4cf31752bdf8a9c86f6571b
[INFO] running `Command { std: "docker" "start" "-a" "cb077001b8d3e6c5405ef16bc6997685f52b7087c4cf31752bdf8a9c86f6571b", 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 crc32fast v1.3.2
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling rle-decode-fast v1.0.3
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling minisign-verify v0.2.1
[INFO] [stderr]    Compiling libflate_lz77 v1.2.0
[INFO] [stderr]    Compiling libflate v1.3.0
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.51/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] 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] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "cb077001b8d3e6c5405ef16bc6997685f52b7087c4cf31752bdf8a9c86f6571b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb077001b8d3e6c5405ef16bc6997685f52b7087c4cf31752bdf8a9c86f6571b", kill_on_drop: false }`
[INFO] [stdout] cb077001b8d3e6c5405ef16bc6997685f52b7087c4cf31752bdf8a9c86f6571b
