[INFO] updating cached repository https://github.com/dongri/mailgun-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 42d79440f8e75a830166648f41cd5017c6c95b75
[INFO] checking dongri/mailgun-rs/42d79440f8e75a830166648f41cd5017c6c95b75 against master#ff1737bb00913444173658b4e0b274fd79aabf66 for pr-132712-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdongri%2Fmailgun-rs" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dongri/mailgun-rs on toolchain ff1737bb00913444173658b4e0b274fd79aabf66
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dongri/mailgun-rs
[INFO] finished tweaking git repo https://github.com/dongri/mailgun-rs
[INFO] tweaked toml for git repo https://github.com/dongri/mailgun-rs written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/dongri/mailgun-rs 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" "+ff1737bb00913444173658b4e0b274fd79aabf66" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3c2d7b2fb27a5b44bc599c3053e989a01f922304ea712c8c48df7e007dee457c
[INFO] running `Command { std: "docker" "start" "-a" "3c2d7b2fb27a5b44bc599c3053e989a01f922304ea712c8c48df7e007dee457c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c2d7b2fb27a5b44bc599c3053e989a01f922304ea712c8c48df7e007dee457c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c2d7b2fb27a5b44bc599c3053e989a01f922304ea712c8c48df7e007dee457c", kill_on_drop: false }`
[INFO] [stdout] 3c2d7b2fb27a5b44bc599c3053e989a01f922304ea712c8c48df7e007dee457c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 03f5ec611c08c23282c743ed117da55db17b4ed2ec7ad5421126b4f0bef08aee
[INFO] running `Command { std: "docker" "start" "-a" "03f5ec611c08c23282c743ed117da55db17b4ed2ec7ad5421126b4f0bef08aee", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.58
[INFO] [stderr]    Compiling quote v1.0.27
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling tokio v1.28.1
[INFO] [stderr]     Checking tracing-core v0.1.31
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling serde v1.0.163
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking memchr v2.5.0
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling httparse v1.8.0
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]     Checking hashbrown v0.12.3
[INFO] [stderr]     Checking percent-encoding v2.2.0
[INFO] [stderr]     Checking tracing v0.1.37
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.58/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 unicode-bidi v0.3.13
[INFO] [stderr]     Checking form_urlencoded v1.1.0
[INFO] [stderr]    Compiling serde_json v1.0.96
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking try-lock v0.2.4
[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" "03f5ec611c08c23282c743ed117da55db17b4ed2ec7ad5421126b4f0bef08aee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03f5ec611c08c23282c743ed117da55db17b4ed2ec7ad5421126b4f0bef08aee", kill_on_drop: false }`
[INFO] [stdout] 03f5ec611c08c23282c743ed117da55db17b4ed2ec7ad5421126b4f0bef08aee