[INFO] updating cached repository https://github.com/loalang/loalang
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 745edc192564b3f362ad1623fbb8853fcefa876e
[INFO] checking loalang/loalang against master#bd0bacc694d7d8175804bb6f690cb846bfa4a9ee for pr-71665
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Floalang%2Floalang" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/loalang/loalang on toolchain bd0bacc694d7d8175804bb6f690cb846bfa4a9ee
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/loalang/loalang
[INFO] finished tweaking git repo https://github.com/loalang/loalang
[INFO] tweaked toml for git repo https://github.com/loalang/loalang written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/loalang/loalang already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 2a2d4d813c212337ba02a650eb58c540359099660575f3b73ee1f50f1e4d5f14
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "2a2d4d813c212337ba02a650eb58c540359099660575f3b73ee1f50f1e4d5f14"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling unicode-segmentation v1.5.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking peekmore v0.4.0
[INFO] [stderr]     Checking ngrammatic v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling bincode v1.2.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.5
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]    Compiling strum_macros v0.17.1
[INFO] [stderr]     Checking serde v1.0.101
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking fraction v0.6.2
[INFO] [stderr]     Checking loalang v0.1.20 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `serde_yaml`
[INFO] [stderr]  --> src/lib/fixture_tests.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | extern crate serde_yaml;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: could not compile `loalang`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/lib/vm/call_stack.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 | /         std::mem::replace(
[INFO] [stderr] 34 | |             self,
[INFO] [stderr] 35 | |             CallStack(Some(Arc::new(StackFrame {
[INFO] [stderr] 36 | |                 parent,
[INFO] [stderr] ...  |
[INFO] [stderr] 41 | |             }))),
[INFO] [stderr] 42 | |         );
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/lib/vm/call_stack.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |         std::mem::replace(self, CallStack(parent));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/lib/optimization/optimizer.rs:308:9
[INFO] [stderr]     |
[INFO] [stderr] 308 |         std::mem::replace(self, optimized);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2a2d4d813c212337ba02a650eb58c540359099660575f3b73ee1f50f1e4d5f14"`
[INFO] running `"docker" "rm" "-f" "2a2d4d813c212337ba02a650eb58c540359099660575f3b73ee1f50f1e4d5f14"`
[INFO] [stdout] 2a2d4d813c212337ba02a650eb58c540359099660575f3b73ee1f50f1e4d5f14