[INFO] fetching crate uber_api 0.2.8...
[INFO] building uber_api-0.2.8 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate uber_api 0.2.8 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate uber_api 0.2.8
[INFO] finished tweaking crates.io crate uber_api 0.2.8
[INFO] tweaked toml for crates.io crate uber_api 0.2.8 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate uber_api 0.2.8 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate uber_api 0.2.8 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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f9d7ad9dc0923414a5e1665cccb73a7c92691c1a86fc60406040f52d7cf60c86
[INFO] running `Command { std: "docker" "start" "-a" "f9d7ad9dc0923414a5e1665cccb73a7c92691c1a86fc60406040f52d7cf60c86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9d7ad9dc0923414a5e1665cccb73a7c92691c1a86fc60406040f52d7cf60c86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9d7ad9dc0923414a5e1665cccb73a7c92691c1a86fc60406040f52d7cf60c86", kill_on_drop: false }`
[INFO] [stdout] f9d7ad9dc0923414a5e1665cccb73a7c92691c1a86fc60406040f52d7cf60c86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ae187aa721e745cfc82c17774d3864e9b1dc7ce533cc4b7b7e54834ada5ebfef
[INFO] running `Command { std: "docker" "start" "-a" "ae187aa721e745cfc82c17774d3864e9b1dc7ce533cc4b7b7e54834ada5ebfef", kill_on_drop: false }`
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]    Compiling parking_lot_core v0.9.7
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling tokio v1.25.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.50
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling socket2 v0.4.7
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling num_cpus v1.15.0
[INFO] [stderr]    Compiling mio v0.8.5
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling futures-util v0.3.25
[INFO] [stderr]    Compiling tracing v0.1.37
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling futures-channel v0.3.25
[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 tinyvec v1.6.0
[INFO] [stderr]    Compiling httparse v1.8.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling ryu v1.0.12
[INFO] [stderr]    Compiling percent-encoding v2.2.0
[INFO] [stderr]    Compiling try-lock v0.2.4
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling form_urlencoded v1.1.0
[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" "ae187aa721e745cfc82c17774d3864e9b1dc7ce533cc4b7b7e54834ada5ebfef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae187aa721e745cfc82c17774d3864e9b1dc7ce533cc4b7b7e54834ada5ebfef", kill_on_drop: false }`
[INFO] [stdout] ae187aa721e745cfc82c17774d3864e9b1dc7ce533cc4b7b7e54834ada5ebfef