[INFO] updating cached repository Evanjs/grkcheck
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Evanjs/grkcheck
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Evanjs/grkcheck" "work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/Evanjs/grkcheck"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/Evanjs/grkcheck'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Evanjs/grkcheck" "work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/Evanjs/grkcheck"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/Evanjs/grkcheck'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1b747c72dfc65110780a2aa9e7d32ef4779db8e3
[INFO] sha for GitHub repo Evanjs/grkcheck: 1b747c72dfc65110780a2aa9e7d32ef4779db8e3
[INFO] validating manifest of Evanjs/grkcheck on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Evanjs/grkcheck on toolchain try#58b21121d0b447ceb3f1a655155d802191acf044
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Evanjs/grkcheck
[INFO] finished frobbing Evanjs/grkcheck
[INFO] frobbed toml for Evanjs/grkcheck written to work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/Evanjs/grkcheck/Cargo.toml
[INFO] started frobbing Evanjs/grkcheck
[INFO] finished frobbing Evanjs/grkcheck
[INFO] frobbed toml for Evanjs/grkcheck written to work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/Evanjs/grkcheck/Cargo.toml
[INFO] crate Evanjs/grkcheck already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Evanjs/grkcheck against try#58b21121d0b447ceb3f1a655155d802191acf044 for pr-61100
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-61100/worker-2/try#58b21121d0b447ceb3f1a655155d802191acf044:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/Evanjs/grkcheck:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] f5b2b7cb8b9fffb7bc1f44905442926645231d1a5a11f18f56ea78ee45059a07
[INFO] running `"docker" "start" "-a" "f5b2b7cb8b9fffb7bc1f44905442926645231d1a5a11f18f56ea78ee45059a07"`
[INFO] [stderr]    Compiling libc v0.2.38
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]    Compiling serde_json v1.0.10
[INFO] [stderr]     Checking dtoa-short v0.3.1
[INFO] [stderr]     Checking debug_unreachable v0.1.1
[INFO] [stderr]    Compiling cssparser v0.23.2
[INFO] [stderr]    Compiling html5ever v0.22.0
[INFO] [stderr]     Checking thread-id v2.0.0
[INFO] [stderr]     Checking uuid v0.5.1
[INFO] [stderr]     Checking nix v0.10.0
[INFO] [stderr]     Checking openssl v0.9.24
[INFO] [stderr]     Checking nix v0.7.0
[INFO] [stderr]     Checking hyper v0.11.21
[INFO] [stderr]     Checking futf v0.1.3
[INFO] [stderr]     Checking thread_local v0.2.7
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr]     Checking tendril v0.4.0
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]     Checking regex v0.1.80
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]     Checking semver-parser v0.6.2
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]     Checking semver v0.4.1
[INFO] [stderr]     Checking native-tls v0.1.5
[INFO] [stderr]    Compiling string_cache_codegen v0.4.0
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]     Checking tokio-tls v0.1.4
[INFO] [stderr]     Checking linuxver v0.1.0
[INFO] [stderr]    Compiling selectors v0.19.0
[INFO] [stderr]    Compiling cssparser-macros v0.3.0
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.4
[INFO] [stderr]     Checking hyper-tls v0.1.2
[INFO] [stderr]    Compiling string_cache v0.7.1
[INFO] [stderr]    Compiling markup5ever v0.7.2
[INFO] [stderr]     Checking reqwest v0.8.5
[INFO] [stderr] warning[E0506]: cannot assign to `self.input.cached_token` because it is borrowed
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/cssparser-0.23.2/src/parser.rs:572:17
[INFO] [stderr]     |
[INFO] [stderr] 547 |     pub fn next_including_whitespace_and_comments(&mut self) -> Result<&Token<'i>, BasicParseError<'i>> {
[INFO] [stderr]     |                                                   - let's call the lifetime of this reference `'1`
[INFO] [stderr] ...
[INFO] [stderr] 560 |             Some(ref cached_token)
[INFO] [stderr]     |                  ---------------- borrow of `self.input.cached_token` occurs here
[INFO] [stderr] ...
[INFO] [stderr] 572 |                 self.input.cached_token = Some(CachedToken {
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `self.input.cached_token` occurs here
[INFO] [stderr] ...
[INFO] [stderr] 584 |         Ok(token)
[INFO] [stderr]     |         --------- returning this value requires that `self.input.cached_token.0` is borrowed for `'1`
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]     Checking kuchiki v0.7.0
[INFO] [stderr]     Checking krcheck v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0635]: unknown feature `alloc_system`
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(alloc_system)]
[INFO] [stderr]   |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: Could not compile `krcheck`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0635]: unknown feature `alloc_system`
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(alloc_system)]
[INFO] [stderr]   |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: Could not compile `krcheck`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f5b2b7cb8b9fffb7bc1f44905442926645231d1a5a11f18f56ea78ee45059a07"`
[INFO] running `"docker" "rm" "-f" "f5b2b7cb8b9fffb7bc1f44905442926645231d1a5a11f18f56ea78ee45059a07"`
[INFO] [stdout] f5b2b7cb8b9fffb7bc1f44905442926645231d1a5a11f18f56ea78ee45059a07