[INFO] cloning repository https://github.com/jaredscarr/alternative-language
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jaredscarr/alternative-language" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredscarr%2Falternative-language", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredscarr%2Falternative-language'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ccd4fa0e018eb7da6e89fa66f6725b057b73d700
[INFO] testing jaredscarr/alternative-language against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredscarr%2Falternative-language" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jaredscarr/alternative-language
[INFO] finished tweaking git repo https://github.com/jaredscarr/alternative-language
[INFO] tweaked toml for git repo https://github.com/jaredscarr/alternative-language written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jaredscarr/alternative-language on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jaredscarr/alternative-language 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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dirs v1.0.5
[INFO] [stderr]   Downloaded crossbeam-utils v0.8.15
[INFO] [stderr]   Downloaded clippy v0.0.302
[INFO] [stderr]   Downloaded term v0.5.2
[INFO] [stderr]   Downloaded serde_derive v1.0.162
[INFO] [stderr]   Downloaded serde v1.0.162
[INFO] [stderr]   Downloaded csv v1.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2643890934e0118e95e42ed56059844e4e6090b658896f039543bf9dbc4c3a81
[INFO] running `Command { std: "docker" "start" "-a" "2643890934e0118e95e42ed56059844e4e6090b658896f039543bf9dbc4c3a81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2643890934e0118e95e42ed56059844e4e6090b658896f039543bf9dbc4c3a81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2643890934e0118e95e42ed56059844e4e6090b658896f039543bf9dbc4c3a81", kill_on_drop: false }`
[INFO] [stdout] 2643890934e0118e95e42ed56059844e4e6090b658896f039543bf9dbc4c3a81
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 58ed17a85f3d87bf609c1e82f293d2dba63e1b13f6261c19fe5e3cacb455975f
[INFO] running `Command { std: "docker" "start" "-a" "58ed17a85f3d87bf609c1e82f293d2dba63e1b13f6261c19fe5e3cacb455975f", kill_on_drop: false }`
[INFO] [stderr] warning: alt_lang_project v0.1.0 (/opt/rustwide/workdir) ignoring invalid dependency `clippy` which is missing a lib target
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling serde_derive v1.0.162
[INFO] [stderr]    Compiling serde v1.0.162
[INFO] [stderr]    Compiling serde_json v1.0.96
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling regex-syntax v0.7.1
[INFO] [stderr]    Compiling aho-corasick v1.0.1
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.56/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" "58ed17a85f3d87bf609c1e82f293d2dba63e1b13f6261c19fe5e3cacb455975f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58ed17a85f3d87bf609c1e82f293d2dba63e1b13f6261c19fe5e3cacb455975f", kill_on_drop: false }`
[INFO] [stdout] 58ed17a85f3d87bf609c1e82f293d2dba63e1b13f6261c19fe5e3cacb455975f