[INFO] cloning repository https://github.com/nim65s/debug-bitflags-serde-postcard
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nim65s/debug-bitflags-serde-postcard" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnim65s%2Fdebug-bitflags-serde-postcard", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnim65s%2Fdebug-bitflags-serde-postcard'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 14d86036343faa03ce95ac54cd5b4a894d7db4b2
[INFO] testing nim65s/debug-bitflags-serde-postcard against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnim65s%2Fdebug-bitflags-serde-postcard" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nim65s/debug-bitflags-serde-postcard
[INFO] finished tweaking git repo https://github.com/nim65s/debug-bitflags-serde-postcard
[INFO] tweaked toml for git repo https://github.com/nim65s/debug-bitflags-serde-postcard written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nim65s/debug-bitflags-serde-postcard on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nim65s/debug-bitflags-serde-postcard 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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/bitflags/bitflags`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded itoa v1.0.5
[INFO] [stderr]   Downloaded hash32 v0.2.1
[INFO] [stderr]   Downloaded postcard-derive v0.1.0
[INFO] [stderr]   Downloaded atomic-polyfill v0.1.11
[INFO] [stderr]   Downloaded const_format_proc_macros v0.2.29
[INFO] [stderr]   Downloaded unicode-xid v0.2.4
[INFO] [stderr]   Downloaded cobs v0.2.3
[INFO] [stderr]   Downloaded critical-section v1.1.1
[INFO] [stderr]   Downloaded ryu v1.0.12
[INFO] [stderr]   Downloaded spin v0.9.4
[INFO] [stderr]   Downloaded const_format v0.2.30
[INFO] [stderr]   Downloaded heapless v0.7.16
[INFO] [stderr]   Downloaded serde_json v1.0.91
[INFO] [stderr]   Downloaded postcard v1.0.2
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 40a4dd916888944e37efb529eb41c487bd209d77c9ff0a601ba60f7880d97d62
[INFO] running `Command { std: "docker" "start" "-a" "40a4dd916888944e37efb529eb41c487bd209d77c9ff0a601ba60f7880d97d62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "40a4dd916888944e37efb529eb41c487bd209d77c9ff0a601ba60f7880d97d62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40a4dd916888944e37efb529eb41c487bd209d77c9ff0a601ba60f7880d97d62", kill_on_drop: false }`
[INFO] [stdout] 40a4dd916888944e37efb529eb41c487bd209d77c9ff0a601ba60f7880d97d62
[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=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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27575d2d70b0700ee0291131b236f71a0a6bed2e736c3978c489b2506771755d
[INFO] running `Command { std: "docker" "start" "-a" "27575d2d70b0700ee0291131b236f71a0a6bed2e736c3978c489b2506771755d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling semver v1.0.16
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling serde_json v1.0.91
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling cobs v0.2.3
[INFO] [stderr]    Compiling ryu v1.0.12
[INFO] [stderr]    Compiling itoa v1.0.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.50
[INFO] [stderr]    Compiling spin v0.9.4
[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] [stderr]    Compiling hash32 v0.2.1
[INFO] [stderr]    Compiling rustc_version v0.4.0
[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" "27575d2d70b0700ee0291131b236f71a0a6bed2e736c3978c489b2506771755d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27575d2d70b0700ee0291131b236f71a0a6bed2e736c3978c489b2506771755d", kill_on_drop: false }`
[INFO] [stdout] 27575d2d70b0700ee0291131b236f71a0a6bed2e736c3978c489b2506771755d