[INFO] cloning repository https://github.com/zjma/bls12381-encodings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zjma/bls12381-encodings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzjma%2Fbls12381-encodings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzjma%2Fbls12381-encodings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1c299353ce09f6303e4870ab252bdc5e412e21e3
[INFO] building zjma/bls12381-encodings against try#58b1b3c5342a414c161338871f8004258ccef2a7 for pr-149937
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzjma%2Fbls12381-encodings" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/zjma/bls12381-encodings
[INFO] finished tweaking git repo https://github.com/zjma/bls12381-encodings
[INFO] tweaked toml for git repo https://github.com/zjma/bls12381-encodings written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/zjma/bls12381-encodings on toolchain 58b1b3c5342a414c161338871f8004258ccef2a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/zjma/bls12381-encodings 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" "+58b1b3c5342a414c161338871f8004258ccef2a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serial_test_derive v0.10.0
[INFO] [stderr]   Downloaded serial_test v0.10.0
[INFO] [stderr]   Downloaded zeroize_derive v1.3.3
[INFO] [stderr]   Downloaded num_cpus v1.14.0
[INFO] [stderr]   Downloaded pairing v0.22.0
[INFO] [stderr]   Downloaded futures-io v0.3.25
[INFO] [stderr]   Downloaded which v4.3.0
[INFO] [stderr]   Downloaded paste v1.0.11
[INFO] [stderr]   Downloaded dashmap v5.4.0
[INFO] [stderr]   Downloaded futures-executor v0.3.25
[INFO] [stderr]   Downloaded futures v0.3.25
[INFO] [stderr]   Downloaded pest v2.5.1
[INFO] [stderr]   Downloaded windows_aarch64_gnullvm v0.42.0
[INFO] [stderr]   Downloaded blst v0.3.10
[INFO] [stderr]   Downloaded windows_x86_64_gnullvm v0.42.0
[INFO] [stderr]   Downloaded bls12_381 v0.7.1
[INFO] [stderr]   Downloaded libc v0.2.138
[INFO] [stderr]   Downloaded windows_aarch64_msvc v0.42.0
[INFO] [stderr]   Downloaded windows_x86_64_msvc v0.42.0
[INFO] [stderr]   Downloaded windows_i686_gnu v0.42.0
[INFO] [stderr]   Downloaded windows_x86_64_gnu v0.42.0
[INFO] [stderr]   Downloaded windows_i686_msvc v0.42.0
[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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f7226eb5c5b7e124728dbf77e8e2dfa7470d1c424736e4a7eca86d08aa6d4825
[INFO] running `Command { std: "docker" "start" "-a" "f7226eb5c5b7e124728dbf77e8e2dfa7470d1c424736e4a7eca86d08aa6d4825", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f7226eb5c5b7e124728dbf77e8e2dfa7470d1c424736e4a7eca86d08aa6d4825", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7226eb5c5b7e124728dbf77e8e2dfa7470d1c424736e4a7eca86d08aa6d4825", kill_on_drop: false }`
[INFO] [stdout] f7226eb5c5b7e124728dbf77e8e2dfa7470d1c424736e4a7eca86d08aa6d4825
[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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+58b1b3c5342a414c161338871f8004258ccef2a7" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20211f5f21ab6b271fa0703003f70bda07cba8330da7712ee858aab5ceaa3847
[INFO] running `Command { std: "docker" "start" "-a" "20211f5f21ab6b271fa0703003f70bda07cba8330da7712ee858aab5ceaa3847", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling thiserror v1.0.38
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling libc v0.2.138
[INFO] [stderr]    Compiling ucd-trie v0.1.5
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.49/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 futures-core v0.3.25
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[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" "20211f5f21ab6b271fa0703003f70bda07cba8330da7712ee858aab5ceaa3847", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20211f5f21ab6b271fa0703003f70bda07cba8330da7712ee858aab5ceaa3847", kill_on_drop: false }`
[INFO] [stdout] 20211f5f21ab6b271fa0703003f70bda07cba8330da7712ee858aab5ceaa3847