[INFO] fetching crate rlrn 0.3.0...
[INFO] checking rlrn-0.3.0 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate rlrn 0.3.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate rlrn 0.3.0
[INFO] finished tweaking crates.io crate rlrn 0.3.0
[INFO] tweaked toml for crates.io crate rlrn 0.3.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rlrn 0.3.0 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rlrn 0.3.0 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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded itoa v1.0.3
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[INFO] [stderr]   Downloaded redox_termios v0.1.2
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[INFO] [stderr]   Downloaded enum-map v2.4.1
[INFO] [stderr]   Downloaded stable_deref_trait v1.2.0
[INFO] [stderr]   Downloaded darling_core v0.13.4
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[INFO] [stderr]   Downloaded thiserror v1.0.37
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[INFO] [stderr]   Downloaded serde v1.0.145
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[INFO] [stderr]   Downloaded serde_derive v1.0.145
[INFO] [stderr]   Downloaded quote v1.0.21
[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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1475e8e45459209ac8911786ad21db398cf2ee54a070b7f5cfef7c3cf8341fa
[INFO] running `Command { std: "docker" "start" "-a" "c1475e8e45459209ac8911786ad21db398cf2ee54a070b7f5cfef7c3cf8341fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1475e8e45459209ac8911786ad21db398cf2ee54a070b7f5cfef7c3cf8341fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1475e8e45459209ac8911786ad21db398cf2ee54a070b7f5cfef7c3cf8341fa", kill_on_drop: false }`
[INFO] [stdout] c1475e8e45459209ac8911786ad21db398cf2ee54a070b7f5cfef7c3cf8341fa
[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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4689d206cdb447f344161a79c2d5dd7a3182711a2b752a121b06244acabbdc4
[INFO] running `Command { std: "docker" "start" "-a" "b4689d206cdb447f344161a79c2d5dd7a3182711a2b752a121b06244acabbdc4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling libc v0.2.134
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling serde_derive v1.0.145
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking once_cell v1.15.0
[INFO] [stderr]     Checking itoa v1.0.3
[INFO] [stderr]     Checking num_threads v0.1.6
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling signal-hook v0.3.14
[INFO] [stderr]    Compiling thiserror v1.0.37
[INFO] [stderr]     Checking os_str_bytes v6.3.0
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking xi-unicode v0.3.0
[INFO] [stderr]     Checking unicode-segmentation v1.10.0
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]     Checking clap_lex v0.3.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking iana-time-zone v0.1.50
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking strsim v0.10.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.46/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 crossbeam-channel v0.5.6
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling ahash v0.8.0
[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" "b4689d206cdb447f344161a79c2d5dd7a3182711a2b752a121b06244acabbdc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4689d206cdb447f344161a79c2d5dd7a3182711a2b752a121b06244acabbdc4", kill_on_drop: false }`
[INFO] [stdout] b4689d206cdb447f344161a79c2d5dd7a3182711a2b752a121b06244acabbdc4