[INFO] updating cached repository https://github.com/jechase/rlox
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 230eb638a84406f9de10f057b182bc3baa465242
[INFO] checking jechase/rlox against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjechase%2Frlox" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jechase/rlox on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jechase/rlox
[INFO] finished tweaking git repo https://github.com/jechase/rlox
[INFO] tweaked toml for git repo https://github.com/jechase/rlox written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/jechase/rlox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a32520e31c98c1c20a061a4d43f15ef1609ad724220601efaf3f0676fc99e8cd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a32520e31c98c1c20a061a4d43f15ef1609ad724220601efaf3f0676fc99e8cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a32520e31c98c1c20a061a4d43f15ef1609ad724220601efaf3f0676fc99e8cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a32520e31c98c1c20a061a4d43f15ef1609ad724220601efaf3f0676fc99e8cd", kill_on_drop: false }`
[INFO] [stdout] a32520e31c98c1c20a061a4d43f15ef1609ad724220601efaf3f0676fc99e8cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ec31c9e486c6fe8f7fcfeb58aac9c0c8923ce7173bf46b8c1d9c91f06716f75b
[INFO] running `Command { std: "docker" "start" "-a" "ec31c9e486c6fe8f7fcfeb58aac9c0c8923ce7173bf46b8c1d9c91f06716f75b", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling cc v1.0.23
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]     Checking utf-8 v0.7.4
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.18
[INFO] [stderr]     Checking new_debug_unreachable v1.0.1
[INFO] [stderr]     Checking futf v0.1.4
[INFO] [stderr]     Checking tendril v0.4.0
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling display_derive v0.0.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]     Checking backtrace v0.3.9
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]     Checking failure v0.1.2
[INFO] [stderr]     Checking rlox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib/scanner.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |         let text = self.source.get(self.start..self.current).unwrap();
[INFO] [stdout]     |                    ----------- immutable borrow occurs here
[INFO] [stdout] 194 |         self.build_token(
[INFO] [stdout]     |         ^^^^ mutable borrow occurs here
[INFO] [stdout] 195 |             TokenType::Number,
[INFO] [stdout] 196 |             Primitive::Number(f64::from_str(text).expect(&format!("parse float: {}", text))),
[INFO] [stdout]     |                                             ---- immutable borrow later used here
[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 E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rlox`.
[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] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib/scanner.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |         let text = self.source.get(self.start..self.current).unwrap();
[INFO] [stdout]     |                    ----------- immutable borrow occurs here
[INFO] [stdout] 194 |         self.build_token(
[INFO] [stdout]     |         ^^^^ mutable borrow occurs here
[INFO] [stdout] 195 |             TokenType::Number,
[INFO] [stdout] 196 |             Primitive::Number(f64::from_str(text).expect(&format!("parse float: {}", text))),
[INFO] [stdout]     |                                             ---- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ec31c9e486c6fe8f7fcfeb58aac9c0c8923ce7173bf46b8c1d9c91f06716f75b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec31c9e486c6fe8f7fcfeb58aac9c0c8923ce7173bf46b8c1d9c91f06716f75b", kill_on_drop: false }`
[INFO] [stdout] ec31c9e486c6fe8f7fcfeb58aac9c0c8923ce7173bf46b8c1d9c91f06716f75b