[INFO] fetching crate saltyrtc-client 0.9.0...
[INFO] building saltyrtc-client-0.9.0 against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] extracting crate saltyrtc-client 0.9.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate saltyrtc-client 0.9.0
[INFO] finished tweaking crates.io crate saltyrtc-client 0.9.0
[INFO] tweaked toml for crates.io crate saltyrtc-client 0.9.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate saltyrtc-client 0.9.0 on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate saltyrtc-client 0.9.0 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" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unicode-ident v1.0.4
[INFO] [stderr]   Downloaded xsalsa20poly1305 v0.8.0
[INFO] [stderr]   Downloaded salsa20 v0.9.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.44
[INFO] [stderr]   Downloaded websocket v0.26.5
[INFO] [stderr]   Downloaded websocket-base v0.26.5
[INFO] [stderr]   Downloaded syn v1.0.101
[INFO] [stderr]   Downloaded num-complex v0.4.2
[INFO] [stderr]   Downloaded anyhow v1.0.65
[INFO] [stderr]   Downloaded smallvec v1.9.0
[INFO] [stderr]   Downloaded ordered-float v2.10.0
[INFO] [stderr]   Downloaded iana-time-zone v0.1.50
[INFO] [stderr]   Downloaded clap_derive v3.2.18
[INFO] [stderr]   Downloaded tokio-timer v0.1.2
[INFO] [stderr]   Downloaded security-framework v2.7.0
[INFO] [stderr]   Downloaded backtrace v0.3.66
[INFO] [stderr]   Downloaded cursive v0.20.0
[INFO] [stderr]   Downloaded time v0.3.14
[INFO] [stderr]   Downloaded chacha20poly1305 v0.9.1
[INFO] [stderr]   Downloaded hyper v0.10.16
[INFO] [stderr]   Downloaded cursive_core v0.3.5
[INFO] [stderr]   Downloaded clap v3.2.22
[INFO] [stderr]   Downloaded scoped-tls v0.1.2
[INFO] [stderr]   Downloaded tokio-tls v0.2.1
[INFO] [stderr]   Downloaded unicode-segmentation v1.10.0
[INFO] [stderr]   Downloaded object v0.29.0
[INFO] [stderr]   Downloaded arc-swap v1.5.1
[INFO] [stderr]   Downloaded bumpalo v3.11.0
[INFO] [stderr]   Downloaded chrono v0.4.22
[INFO] [stderr]   Downloaded serde_json v1.0.85
[INFO] [stderr]   Downloaded tokio-core v0.1.18
[INFO] [stderr]   Downloaded openssl v0.10.42
[INFO] [stderr]   Downloaded serde v1.0.145
[INFO] [stderr]   Downloaded libc v0.2.133
[INFO] [stderr]   Downloaded textwrap v0.15.1
[INFO] [stderr]   Downloaded chacha20 v0.8.2
[INFO] [stderr]   Downloaded crypto_box v0.7.2
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[INFO] [stderr]   Downloaded parking_lot_core v0.9.3
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 481b085c47266affbfcc784018c2155c6f83b44b93ebac767b36f55d0ac015c9
[INFO] running `Command { std: "docker" "start" "-a" "481b085c47266affbfcc784018c2155c6f83b44b93ebac767b36f55d0ac015c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "481b085c47266affbfcc784018c2155c6f83b44b93ebac767b36f55d0ac015c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "481b085c47266affbfcc784018c2155c6f83b44b93ebac767b36f55d0ac015c9", kill_on_drop: false }`
[INFO] [stdout] 481b085c47266affbfcc784018c2155c6f83b44b93ebac767b36f55d0ac015c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b4fac4cf7cf5653c0882ff566e5e9319ff6b201f5c087ad4f637bb4a3d522ab
[INFO] running `Command { std: "docker" "start" "-a" "3b4fac4cf7cf5653c0882ff566e5e9319ff6b201f5c087ad4f637bb4a3d522ab", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.44
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling libc v0.2.133
[INFO] [stderr]    Compiling serde_derive v1.0.145
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling openssl-sys v0.9.76
[INFO] [stderr]    Compiling lock_api v0.3.4
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling openssl v0.10.42
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.44/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 once_cell v1.15.0
[INFO] [stderr]    Compiling native-tls v0.2.10
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling unicode-normalization v0.1.22
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling unicode-bidi v0.3.8
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]    Compiling matches v0.1.9
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling backtrace v0.3.66
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling tokio-executor v0.1.10
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling fake-simd v0.1.2
[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" "3b4fac4cf7cf5653c0882ff566e5e9319ff6b201f5c087ad4f637bb4a3d522ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b4fac4cf7cf5653c0882ff566e5e9319ff6b201f5c087ad4f637bb4a3d522ab", kill_on_drop: false }`
[INFO] [stdout] 3b4fac4cf7cf5653c0882ff566e5e9319ff6b201f5c087ad4f637bb4a3d522ab