[INFO] cloning repository https://github.com/guialbuk/hello_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guialbuk/hello_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguialbuk%2Fhello_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguialbuk%2Fhello_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 79d7ac4b59b5ba3fc10f72317423f55edfa6bda8
[INFO] testing guialbuk/hello_rust against try#a7ce54db9b096bd1098d07c645b489195a667c9f for pr-137940
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguialbuk%2Fhello_rust" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guialbuk/hello_rust on toolchain a7ce54db9b096bd1098d07c645b489195a667c9f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/guialbuk/hello_rust
[INFO] finished tweaking git repo https://github.com/guialbuk/hello_rust
[INFO] tweaked toml for git repo https://github.com/guialbuk/hello_rust written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/guialbuk/hello_rust 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" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 13f007ee57854eaf4ea55496b0a902a58d5ce7454191795953fa6181f34d8b39
[INFO] running `Command { std: "docker" "start" "-a" "13f007ee57854eaf4ea55496b0a902a58d5ce7454191795953fa6181f34d8b39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13f007ee57854eaf4ea55496b0a902a58d5ce7454191795953fa6181f34d8b39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13f007ee57854eaf4ea55496b0a902a58d5ce7454191795953fa6181f34d8b39", kill_on_drop: false }`
[INFO] [stdout] 13f007ee57854eaf4ea55496b0a902a58d5ce7454191795953fa6181f34d8b39
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+a7ce54db9b096bd1098d07c645b489195a667c9f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe8d402ac3b6a5c8286f98ec9ae2129e1df23f4acd8e43fd6e44748a38c6848b
[INFO] running `Command { std: "docker" "start" "-a" "fe8d402ac3b6a5c8286f98ec9ae2129e1df23f4acd8e43fd6e44748a38c6848b", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.50
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling glob v0.3.1
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling bindgen v0.60.1
[INFO] [stderr]    Compiling regex-syntax v0.6.28
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling shlex v1.1.0
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling libloading v0.7.4
[INFO] [stderr]    Compiling shell-words v1.1.0
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling rb-sys-env v0.1.2
[INFO] [stderr]    Compiling clang-sys v1.4.0
[INFO] [stderr]    Compiling magnus v0.4.4
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.50/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] [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" "fe8d402ac3b6a5c8286f98ec9ae2129e1df23f4acd8e43fd6e44748a38c6848b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe8d402ac3b6a5c8286f98ec9ae2129e1df23f4acd8e43fd6e44748a38c6848b", kill_on_drop: false }`
[INFO] [stdout] fe8d402ac3b6a5c8286f98ec9ae2129e1df23f4acd8e43fd6e44748a38c6848b