[INFO] fetching crate learnwell 0.2.1...
[INFO] checking learnwell-0.2.1 against master#bbe853615821442ef11d6cd42a30a73432b38d89 for pr-154205
[INFO] extracting crate learnwell 0.2.1 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate learnwell 0.2.1
[INFO] finished tweaking crates.io crate learnwell 0.2.1
[INFO] tweaked toml for crates.io crate learnwell 0.2.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate learnwell 0.2.1 on toolchain bbe853615821442ef11d6cd42a30a73432b38d89
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate learnwell 0.2.1 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" "+bbe853615821442ef11d6cd42a30a73432b38d89" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded strum v0.24.1
[INFO] [stderr]   Downloaded wayland-commons v0.29.5
[INFO] [stderr]   Downloaded wayland-sys v0.29.5
[INFO] [stderr]   Downloaded strum_macros v0.24.3
[INFO] [stderr]   Downloaded rustversion v1.0.11
[INFO] [stderr]   Downloaded show-image-macros v0.12.3
[INFO] [stderr]   Downloaded cocoa-foundation v0.1.0
[INFO] [stderr]   Downloaded dlib v0.5.0
[INFO] [stderr]   Downloaded range-alloc v0.1.2
[INFO] [stderr]   Downloaded num_enum_derive v0.5.7
[INFO] [stderr]   Downloaded copyless v0.1.5
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.33
[INFO] [stderr]   Downloaded proc-macro-crate v1.2.1
[INFO] [stderr]   Downloaded foreign-types-macros v0.2.2
[INFO] [stderr]   Downloaded num-complex v0.4.3
[INFO] [stderr]   Downloaded profiling v1.0.7
[INFO] [stderr]   Downloaded runnt v0.6.0
[INFO] [stderr]   Downloaded matrixmultiply v0.3.2
[INFO] [stderr]   Downloaded calloop v0.10.5
[INFO] [stderr]   Downloaded safe_arch v0.5.2
[INFO] [stderr]   Downloaded freetype-rs v0.26.0
[INFO] [stderr]   Downloaded glow v0.11.2
[INFO] [stderr]   Downloaded smithay-client-toolkit v0.16.0
[INFO] [stderr]   Downloaded wgpu v0.13.1
[INFO] [stderr]   Downloaded wgpu-core v0.13.2
[INFO] [stderr]   Downloaded nom v7.1.2
[INFO] [stderr]   Downloaded wgpu-hal v0.13.2
[INFO] [stderr]   Downloaded tiny-skia v0.7.0
[INFO] [stderr]   Downloaded wayland-protocols v0.29.5
[INFO] [stderr]   Downloaded nix v0.25.1
[INFO] [stderr]   Downloaded wayland-client v0.29.5
[INFO] [stderr]   Downloaded show-image v0.13.1
[INFO] [stderr]   Downloaded winit v0.27.5
[INFO] [stderr]   Downloaded darling_core v0.13.4
[INFO] [stderr]   Downloaded toml v0.5.10
[INFO] [stderr]   Downloaded tiny-skia-path v0.7.0
[INFO] [stderr]   Downloaded memmap2 v0.5.8
[INFO] [stderr]   Downloaded naga v0.9.0
[INFO] [stderr]   Downloaded wgpu-types v0.13.2
[INFO] [stderr]   Downloaded darling v0.13.4
[INFO] [stderr]   Downloaded cocoa v0.24.1
[INFO] [stderr]   Downloaded sctk-adwaita v0.4.3
[INFO] [stderr]   Downloaded expat-sys v2.1.6
[INFO] [stderr]   Downloaded x11-dl v2.20.1
[INFO] [stderr]   Downloaded core-text v19.2.0
[INFO] [stderr]   Downloaded dwrote v0.11.0
[INFO] [stderr]   Downloaded cmake v0.1.49
[INFO] [stderr]   Downloaded crossfont v0.5.1
[INFO] [stderr]   Downloaded semver v1.0.16
[INFO] [stderr]   Downloaded d3d12 v0.5.0
[INFO] [stderr]   Downloaded parking_lot_core v0.9.5
[INFO] [stderr]   Downloaded servo-fontconfig v0.5.1
[INFO] [stderr]   Downloaded inplace_it v0.3.5
[INFO] [stderr]   Downloaded darling_macro v0.13.4
[INFO] [stderr]   Downloaded wayland-cursor v0.29.5
[INFO] [stderr]   Downloaded num_enum v0.5.7
[INFO] [stderr]   Downloaded ndk-macro v0.3.0
[INFO] [stderr]   Downloaded raw-window-handle v0.5.0
[INFO] [stderr]   Downloaded xcursor v0.3.4
[INFO] [stderr]   Downloaded ndk-glue v0.7.0
[INFO] [stderr]   Downloaded servo-fontconfig-sys v5.1.0
[INFO] [stderr]   Downloaded freetype-sys v0.13.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7c321086adfafa465efb1dcfb80eb61bef5c458a9e73f79ee965b764d433faf8
[INFO] running `Command { std: "docker" "start" "-a" "7c321086adfafa465efb1dcfb80eb61bef5c458a9e73f79ee965b764d433faf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c321086adfafa465efb1dcfb80eb61bef5c458a9e73f79ee965b764d433faf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c321086adfafa465efb1dcfb80eb61bef5c458a9e73f79ee965b764d433faf8", kill_on_drop: false }`
[INFO] [stdout] 7c321086adfafa465efb1dcfb80eb61bef5c458a9e73f79ee965b764d433faf8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+bbe853615821442ef11d6cd42a30a73432b38d89" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f41b0db31e0805669b01c8779ceb591a94b30a66d2ac43be7665e203f8c9276e
[INFO] running `Command { std: "docker" "start" "-a" "f41b0db31e0805669b01c8779ceb591a94b30a66d2ac43be7665e203f8c9276e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling pkg-config v0.3.26
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling xml-rs v0.8.4
[INFO] [stderr]     Checking libloading v0.7.4
[INFO] [stderr]    Compiling cmake v0.1.49
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling parking_lot_core v0.9.5
[INFO] [stderr]     Checking dlib v0.5.0
[INFO] [stderr]    Compiling slotmap v1.0.6
[INFO] [stderr]     Checking downcast-rs v1.2.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking cty v0.2.2
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]    Compiling khronos-egl v4.1.0
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking bytemuck v1.12.3
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.49/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a feature with a similar name: `proc_macro_span_file`
[INFO] [stdout]    |
[INFO] [stdout] 92 -     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout] 92 +     feature(proc_macro_span, proc_macro_span_file)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ash v0.37.2+1.3.238
[INFO] [stderr]    Compiling semver v1.0.16
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]    Compiling futures-channel v0.3.25
[INFO] [stderr]     Checking bit-set v0.5.3
[INFO] [stderr]     Checking codespan-reporting v0.11.1
[INFO] [stderr]     Checking raw-window-handle v0.4.3
[INFO] [stderr]     Checking nom v7.1.2
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]     Checking gpu-alloc-types v0.2.0
[INFO] [stderr]     Checking gpu-descriptor-types v0.1.1
[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" "f41b0db31e0805669b01c8779ceb591a94b30a66d2ac43be7665e203f8c9276e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f41b0db31e0805669b01c8779ceb591a94b30a66d2ac43be7665e203f8c9276e", kill_on_drop: false }`
[INFO] [stdout] f41b0db31e0805669b01c8779ceb591a94b30a66d2ac43be7665e203f8c9276e