[INFO] cloning repository https://github.com/EmmaRamirez/rust-and-webassembly-talk
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EmmaRamirez/rust-and-webassembly-talk" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmmaRamirez%2Frust-and-webassembly-talk", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmmaRamirez%2Frust-and-webassembly-talk'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 748cc3a6a1af9143097345bce25b9fecfdc50064
[INFO] testing EmmaRamirez/rust-and-webassembly-talk against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmmaRamirez%2Frust-and-webassembly-talk" "/workspace/builds/worker-24/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-24/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EmmaRamirez/rust-and-webassembly-talk on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/EmmaRamirez/rust-and-webassembly-talk
[INFO] finished tweaking git repo https://github.com/EmmaRamirez/rust-and-webassembly-talk
[INFO] tweaked toml for git repo https://github.com/EmmaRamirez/rust-and-webassembly-talk written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] crate git repo https://github.com/EmmaRamirez/rust-and-webassembly-talk already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 87cfebdcc42156651531336510d6fe1f9cc8c39e32eeda5e0ecbbce59aa4e0a1
[INFO] running `Command { std: "docker" "start" "-a" "87cfebdcc42156651531336510d6fe1f9cc8c39e32eeda5e0ecbbce59aa4e0a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "87cfebdcc42156651531336510d6fe1f9cc8c39e32eeda5e0ecbbce59aa4e0a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87cfebdcc42156651531336510d6fe1f9cc8c39e32eeda5e0ecbbce59aa4e0a1", kill_on_drop: false }`
[INFO] [stdout] 87cfebdcc42156651531336510d6fe1f9cc8c39e32eeda5e0ecbbce59aa4e0a1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a5858b6741116c5fe300a5156bfbc041a5a7cd1daf44c0f74ae32a7d0bc67de
[INFO] running `Command { std: "docker" "start" "-a" "3a5858b6741116c5fe300a5156bfbc041a5a7cd1daf44c0f74ae32a7d0bc67de", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.12
[INFO] [stderr]    Compiling serde v1.0.71
[INFO] [stderr]    Compiling ryu v0.2.3
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.16
[INFO] [stderr]    Compiling itoa v0.4.2
[INFO] [stderr]    Compiling cfg-if v0.1.5
[INFO] [stderr]    Compiling log v0.4.3
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stdout] error[E0658]: use of unstable library feature 'proc_macro_def_site'
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.12/src/unstable.rs:346:27
[INFO] [stdout]     |
[INFO] [stdout] 346 |             Span::Nightly(proc_macro::Span::def_site())
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #54724 <https://github.com/rust-lang/rust/issues/54724> for more information
[INFO] [stdout]     = help: add `#![feature(proc_macro_def_site)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3a5858b6741116c5fe300a5156bfbc041a5a7cd1daf44c0f74ae32a7d0bc67de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a5858b6741116c5fe300a5156bfbc041a5a7cd1daf44c0f74ae32a7d0bc67de", kill_on_drop: false }`
[INFO] [stdout] 3a5858b6741116c5fe300a5156bfbc041a5a7cd1daf44c0f74ae32a7d0bc67de