[INFO] fetching crate rna-algos 0.1.37...
[INFO] checking rna-algos-0.1.37 against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] extracting crate rna-algos 0.1.37 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate rna-algos 0.1.37 on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rna-algos 0.1.37
[INFO] finished tweaking crates.io crate rna-algos 0.1.37
[INFO] tweaked toml for crates.io crate rna-algos 0.1.37 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate rna-algos 0.1.37 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded enum-map-derive v0.6.0
[INFO] [stderr]   Downloaded enum-map v1.1.1
[INFO] [stderr]   Downloaded triple_accel v0.4.0
[INFO] [stderr]   Downloaded bio-types v0.13.0
[INFO] [stderr]   Downloaded bio v1.1.0
[INFO] [stderr]   Downloaded rna-ss-params v0.1.24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d1fa9937f99b3181c3daa1719cbd2bf3cedce92eddb33736ca4e51109f6c16b
[INFO] running `Command { std: "docker" "start" "-a" "8d1fa9937f99b3181c3daa1719cbd2bf3cedce92eddb33736ca4e51109f6c16b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d1fa9937f99b3181c3daa1719cbd2bf3cedce92eddb33736ca4e51109f6c16b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d1fa9937f99b3181c3daa1719cbd2bf3cedce92eddb33736ca4e51109f6c16b", kill_on_drop: false }`
[INFO] [stdout] 8d1fa9937f99b3181c3daa1719cbd2bf3cedce92eddb33736ca4e51109f6c16b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e2b1d8d9f6cc212e2ce4c5a0e6bc954d8975a3b97952a8fc5cc05a2db1875ef
[INFO] running `Command { std: "docker" "start" "-a" "7e2b1d8d9f6cc212e2ce4c5a0e6bc954d8975a3b97952a8fc5cc05a2db1875ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.50
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling libm v0.2.6
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking bytemuck v1.13.0
[INFO] [stderr]    Compiling paste v1.0.11
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.50/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 ppv-lite86 v0.2.17
[INFO] [stderr]     Checking safe_arch v0.6.0
[INFO] [stderr]    Compiling num-rational v0.4.1
[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" "7e2b1d8d9f6cc212e2ce4c5a0e6bc954d8975a3b97952a8fc5cc05a2db1875ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e2b1d8d9f6cc212e2ce4c5a0e6bc954d8975a3b97952a8fc5cc05a2db1875ef", kill_on_drop: false }`
[INFO] [stdout] 7e2b1d8d9f6cc212e2ce4c5a0e6bc954d8975a3b97952a8fc5cc05a2db1875ef