[INFO] cloning repository https://github.com/u21715994/hash_cash
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/u21715994/hash_cash" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu21715994%2Fhash_cash", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu21715994%2Fhash_cash'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4ff3d0d6fda3b018bf5b18ef5ab0b6b1c661ffe3
[INFO] checking u21715994/hash_cash against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu21715994%2Fhash_cash" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
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[INFO] started tweaking git repo https://github.com/u21715994/hash_cash
[INFO] finished tweaking git repo https://github.com/u21715994/hash_cash
[INFO] tweaked toml for git repo https://github.com/u21715994/hash_cash written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/u21715994/hash_cash on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/u21715994/hash_cash 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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_derive v1.0.149
[INFO] [stderr]   Downloaded serde v1.0.149
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1b4435827ea636182d53df34c29fc7cf5e0ce72723305df54b66c194de077dff
[INFO] running `Command { std: "docker" "start" "-a" "1b4435827ea636182d53df34c29fc7cf5e0ce72723305df54b66c194de077dff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1b4435827ea636182d53df34c29fc7cf5e0ce72723305df54b66c194de077dff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b4435827ea636182d53df34c29fc7cf5e0ce72723305df54b66c194de077dff", kill_on_drop: false }`
[INFO] [stdout] 1b4435827ea636182d53df34c29fc7cf5e0ce72723305df54b66c194de077dff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 38aefb10d55d542849dcac413f09b1d2114b3c9015274196210d2b7029c39f49
[INFO] running `Command { std: "docker" "start" "-a" "38aefb10d55d542849dcac413f09b1d2114b3c9015274196210d2b7029c39f49", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling libc v0.2.138
[INFO] [stderr]    Compiling syn v1.0.105
[INFO] [stderr]    Compiling serde_derive v1.0.149
[INFO] [stderr]    Compiling serde v1.0.149
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling hex_lit v0.1.1
[INFO] [stderr]    Compiling serde_json v1.0.89
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.47/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" "38aefb10d55d542849dcac413f09b1d2114b3c9015274196210d2b7029c39f49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38aefb10d55d542849dcac413f09b1d2114b3c9015274196210d2b7029c39f49", kill_on_drop: false }`
[INFO] [stdout] 38aefb10d55d542849dcac413f09b1d2114b3c9015274196210d2b7029c39f49