[INFO] fetching crate pixtra 0.2.5...
[INFO] testing pixtra-0.2.5 against master#caccb4d0368bd918ef6668af8e13834d07040417 for pr-146098-1
[INFO] extracting crate pixtra 0.2.5 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate pixtra 0.2.5
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate pixtra 0.2.5
[INFO] tweaked toml for crates.io crate pixtra 0.2.5 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate pixtra 0.2.5 on toolchain caccb4d0368bd918ef6668af8e13834d07040417
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate pixtra 0.2.5 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" "+caccb4d0368bd918ef6668af8e13834d07040417" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded simd-adler32 v0.3.4
[INFO] [stderr]   Downloaded zune-inflate v0.2.50
[INFO] [stderr]   Downloaded exr v1.5.3
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 189c2b2bf35e057b796ee9ae19485d094c7a3e6c681a2bf1ee22ca34f1433828
[INFO] running `Command { std: "docker" "start" "-a" "189c2b2bf35e057b796ee9ae19485d094c7a3e6c681a2bf1ee22ca34f1433828", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "189c2b2bf35e057b796ee9ae19485d094c7a3e6c681a2bf1ee22ca34f1433828", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "189c2b2bf35e057b796ee9ae19485d094c7a3e6c681a2bf1ee22ca34f1433828", kill_on_drop: false }`
[INFO] [stdout] 189c2b2bf35e057b796ee9ae19485d094c7a3e6c681a2bf1ee22ca34f1433828
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc531e78c2034e81dab20764029c8c80569f8a3e09c3d599b424a46ec8c1602a
[INFO] running `Command { std: "docker" "start" "-a" "fc531e78c2034e81dab20764029c8c80569f8a3e09c3d599b424a46ec8c1602a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling miniz_oxide v0.6.2
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling futures-core v0.3.26
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling either v1.8.1
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling weezl v0.1.7
[INFO] [stderr]    Compiling spin v0.9.5
[INFO] [stderr]    Compiling simd-adler32 v0.3.4
[INFO] [stderr]    Compiling futures-sink v0.3.26
[INFO] [stderr]    Compiling crossbeam-deque v0.8.2
[INFO] [stderr]    Compiling half v2.2.1
[INFO] [stderr]    Compiling lebe v0.5.2
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling num-complex v0.4.3
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.51/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 zune-inflate v0.2.50
[INFO] [stderr]    Compiling bytemuck v1.13.0
[INFO] [stderr]    Compiling gif v0.11.4
[INFO] [stderr]    Compiling scoped_threadpool v0.1.9
[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" "fc531e78c2034e81dab20764029c8c80569f8a3e09c3d599b424a46ec8c1602a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc531e78c2034e81dab20764029c8c80569f8a3e09c3d599b424a46ec8c1602a", kill_on_drop: false }`
[INFO] [stdout] fc531e78c2034e81dab20764029c8c80569f8a3e09c3d599b424a46ec8c1602a