[INFO] fetching crate zc2 0.0.2-dev...
[INFO] testing zc2-0.0.2-dev against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145330-1
[INFO] extracting crate zc2 0.0.2-dev into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate zc2 0.0.2-dev
[INFO] finished tweaking crates.io crate zc2 0.0.2-dev
[INFO] tweaked toml for crates.io crate zc2 0.0.2-dev written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate zc2 0.0.2-dev 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 zc2 0.0.2-dev 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_spanned v0.6.3
[INFO] [stderr]   Downloaded fallible v0.1.3
[INFO] [stderr]   Downloaded string_cache_codegen v0.4.4
[INFO] [stderr]   Downloaded ifaces v0.1.0
[INFO] [stderr]   Downloaded string_cache_shared v0.3.0
[INFO] [stderr]   Downloaded soup v0.5.1
[INFO] [stderr]   Downloaded bitflags v0.7.0
[INFO] [stderr]   Downloaded string_cache v0.7.5
[INFO] [stderr]   Downloaded markup5ever v0.7.5
[INFO] [stderr]   Downloaded toml v0.8.0
[INFO] [stderr]   Downloaded indexmap v2.0.0
[INFO] [stderr]   Downloaded unsafe-libyaml v0.2.7
[INFO] [stderr]   Downloaded nix v0.8.1
[INFO] [stderr]   Downloaded serde_derive v1.0.159
[INFO] [stderr]   Downloaded serde_yaml v0.9.19
[INFO] [stderr]   Downloaded serde_json v1.0.94
[INFO] [stderr]   Downloaded regex v1.7.1
[INFO] [stderr]   Downloaded html5ever v0.22.5
[INFO] [stderr]   Downloaded syn v2.0.4
[INFO] [stderr]   Downloaded serde v1.0.159
[INFO] [stderr]   Downloaded toml_edit v0.20.0
[INFO] [stderr]   Downloaded clone v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba5d7e34af21a2a29c87032866cb32110662871feac228282f511e573755c022
[INFO] running `Command { std: "docker" "start" "-a" "ba5d7e34af21a2a29c87032866cb32110662871feac228282f511e573755c022", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba5d7e34af21a2a29c87032866cb32110662871feac228282f511e573755c022", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba5d7e34af21a2a29c87032866cb32110662871feac228282f511e573755c022", kill_on_drop: false }`
[INFO] [stdout] ba5d7e34af21a2a29c87032866cb32110662871feac228282f511e573755c022
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7984968a214981cc492c8b7053be83cbb90728fe225e54472a63d0bd5f6f93d
[INFO] running `Command { std: "docker" "start" "-a" "b7984968a214981cc492c8b7053be83cbb90728fe225e54472a63d0bd5f6f93d", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling serde v1.0.159
[INFO] [stderr]    Compiling proc-macro2 v1.0.52
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]    Compiling serde_derive v1.0.159
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling serde_json v1.0.94
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling mac v0.1.1
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling futf v0.1.5
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling tendril v0.4.3
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling hashbrown v0.14.0
[INFO] [stderr]    Compiling aho-corasick v0.7.20
[INFO] [stderr]    Compiling regex-syntax v0.6.28
[INFO] [stderr]    Compiling winnow v0.5.15
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.52/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 bitflags v0.7.0
[INFO] [stderr]    Compiling fallible v0.1.3
[INFO] [stderr]    Compiling unsafe-libyaml v0.2.7
[INFO] [stderr]    Compiling command-macros v0.2.9
[INFO] [stderr]    Compiling clone 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" "b7984968a214981cc492c8b7053be83cbb90728fe225e54472a63d0bd5f6f93d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7984968a214981cc492c8b7053be83cbb90728fe225e54472a63d0bd5f6f93d", kill_on_drop: false }`
[INFO] [stdout] b7984968a214981cc492c8b7053be83cbb90728fe225e54472a63d0bd5f6f93d