[INFO] fetching crate alkyne 0.1.0...
[INFO] checking alkyne-0.1.0 against try#07fecb9cf34c4979a772ba38c99d6d9144768413 for pr-87710
[INFO] extracting crate alkyne 0.1.0 into /workspace/builds/worker-102/source
[INFO] validating manifest of crates.io crate alkyne 0.1.0 on toolchain 07fecb9cf34c4979a772ba38c99d6d9144768413
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-102/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate alkyne 0.1.0
[INFO] finished tweaking crates.io crate alkyne 0.1.0
[INFO] tweaked toml for crates.io crate alkyne 0.1.0 written to /workspace/builds/worker-102/source/Cargo.toml
[INFO] crate crates.io crate alkyne 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustyline v5.0.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 60c97570070c44df45bba8ecc041fd736884e0d1e4c4ee4f5496dafac4e6b8cd
[INFO] running `Command { std: "docker" "start" "-a" "60c97570070c44df45bba8ecc041fd736884e0d1e4c4ee4f5496dafac4e6b8cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "60c97570070c44df45bba8ecc041fd736884e0d1e4c4ee4f5496dafac4e6b8cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60c97570070c44df45bba8ecc041fd736884e0d1e4c4ee4f5496dafac4e6b8cd", kill_on_drop: false }`
[INFO] [stdout] 60c97570070c44df45bba8ecc041fd736884e0d1e4c4ee4f5496dafac4e6b8cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d23c7b20f8458788dbef6b4a37062ac0d382ebd82d5a4211ec1b8991f3784f96
[INFO] running `Command { std: "docker" "start" "-a" "d23c7b20f8458788dbef6b4a37062ac0d382ebd82d5a4211ec1b8991f3784f96", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking unicode-segmentation v1.8.0
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking owning_ref v0.3.3
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]     Checking toolshed v0.8.1
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking rustc_version v0.2.3
[INFO] [stderr]     Checking parking_lot v0.4.8
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]     Checking chashmap v2.2.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking crossbeam-deque v0.7.4
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]     Checking rustyline v5.0.6
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking alkyne v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: unreachable definition
[INFO] [stdout]   --> src/main.rs:34:7
[INFO] [stdout]    |
[INFO] [stdout] 31 |     exec::repl::Executor::new(&arena).execute_loop().unwrap();
[INFO] [stdout]    |     --------------------------------------------------------- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 34 |   let fs = Local::new();
[INFO] [stdout]    |       ^^ unreachable definition
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![deny(unused)]
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    = note: `#[deny(unreachable_code)]` implied by `#[deny(unused)]`
[INFO] [stdout] note: this expression has type `Infallible`, which is uninhabited
[INFO] [stdout]   --> src/main.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     exec::repl::Executor::new(&arena).execute_loop().unwrap();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unreachable definition
[INFO] [stdout]   --> src/main.rs:34:7
[INFO] [stdout]    |
[INFO] [stdout] 31 |     exec::repl::Executor::new(&arena).execute_loop().unwrap();
[INFO] [stdout]    |     --------------------------------------------------------- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 34 |   let fs = Local::new();
[INFO] [stdout]    |       ^^ unreachable definition
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![deny(unused)]
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    = note: `#[deny(unreachable_code)]` implied by `#[deny(unused)]`
[INFO] [stdout] note: this expression has type `Infallible`, which is uninhabited
[INFO] [stdout]   --> src/main.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     exec::repl::Executor::new(&arena).execute_loop().unwrap();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `alkyne` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d23c7b20f8458788dbef6b4a37062ac0d382ebd82d5a4211ec1b8991f3784f96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d23c7b20f8458788dbef6b4a37062ac0d382ebd82d5a4211ec1b8991f3784f96", kill_on_drop: false }`
[INFO] [stdout] d23c7b20f8458788dbef6b4a37062ac0d382ebd82d5a4211ec1b8991f3784f96