[INFO] fetching crate sabre-lang 0.3.0...
[INFO] checking sabre-lang-0.3.0 against try#15a786332e2f0dd343b226ab6bb8ec028a350f73 for pr-81782
[INFO] extracting crate sabre-lang 0.3.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate sabre-lang 0.3.0 on toolchain 15a786332e2f0dd343b226ab6bb8ec028a350f73
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sabre-lang 0.3.0
[INFO] finished tweaking crates.io crate sabre-lang 0.3.0
[INFO] tweaked toml for crates.io crate sabre-lang 0.3.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate sabre-lang 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rust-embed-utils v5.1.0
[INFO] [stderr]   Downloaded rust-embed-impl v5.7.0
[INFO] [stderr]   Downloaded inkwell_internals v0.3.0
[INFO] [stderr]   Downloaded llvm-sys v100.2.0
[INFO] [stderr]   Downloaded inkwell v0.1.0-beta.2
[INFO] [stderr]   Downloaded rust-embed v5.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 661dc8e850a19d438a041b77524ce0db944f1eb596855e06b079b798e0df9c3e
[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" "661dc8e850a19d438a041b77524ce0db944f1eb596855e06b079b798e0df9c3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "661dc8e850a19d438a041b77524ce0db944f1eb596855e06b079b798e0df9c3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "661dc8e850a19d438a041b77524ce0db944f1eb596855e06b079b798e0df9c3e", kill_on_drop: false }`
[INFO] [stdout] 661dc8e850a19d438a041b77524ce0db944f1eb596855e06b079b798e0df9c3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 24f657d1d271d6cae3de1b54d989fdfb0f5e7bfeb07e3ffa285a7e971c41d368
[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" "24f657d1d271d6cae3de1b54d989fdfb0f5e7bfeb07e3ffa285a7e971c41d368", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling syn v1.0.53
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling rust-embed-utils v5.1.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling rust-embed-impl v5.7.0
[INFO] [stderr]    Compiling structopt-derive v0.4.14
[INFO] [stderr]     Checking rust-embed v5.7.0
[INFO] [stderr]     Checking structopt v0.3.21
[INFO] [stderr]     Checking sabre-lang v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/generator/mod.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     return js::JsGenerator::generate(prog);
[INFO] [stdout]    |     -------------------------------------- any code following this expression is unreachable
[INFO] [stdout] 41 | 
[INFO] [stdout] 42 |     panic!("No backend specified");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/generator/mod.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     return js::JsGenerator::generate(prog);
[INFO] [stdout]    |     -------------------------------------- any code following this expression is unreachable
[INFO] [stdout] 41 | 
[INFO] [stdout] 42 |     panic!("No backend specified");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `comp`
[INFO] [stdout]   --> src/command/run.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let comp = Command::new("/usr/bin/cc")
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_comp`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `comp`
[INFO] [stdout]   --> src/command/run.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let comp = Command::new("/usr/bin/cc")
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_comp`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `drop`
[INFO] [stdout]   --> src/parser/parser.rs:74:19
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub(super) fn drop(&mut self, count: usize) {
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Either`
[INFO] [stdout]   --> src/util/mod.rs:19:10
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub enum Either<L, R> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `drop`
[INFO] [stdout]   --> src/parser/parser.rs:74:19
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub(super) fn drop(&mut self, count: usize) {
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Either`
[INFO] [stdout]   --> src/util/mod.rs:19:10
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub enum Either<L, R> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 34.76s
[INFO] running `Command { std: "docker" "inspect" "24f657d1d271d6cae3de1b54d989fdfb0f5e7bfeb07e3ffa285a7e971c41d368", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24f657d1d271d6cae3de1b54d989fdfb0f5e7bfeb07e3ffa285a7e971c41d368", kill_on_drop: false }`
[INFO] [stdout] 24f657d1d271d6cae3de1b54d989fdfb0f5e7bfeb07e3ffa285a7e971c41d368