[INFO] cloning repository https://github.com/doctorn/micro-mitten
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/doctorn/micro-mitten" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdoctorn%2Fmicro-mitten", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdoctorn%2Fmicro-mitten'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 12845eae0252dfc31712167741aa8563c4e1a3d2
[INFO] checking doctorn/micro-mitten/12845eae0252dfc31712167741aa8563c4e1a3d2 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdoctorn%2Fmicro-mitten" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/doctorn/micro-mitten on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/doctorn/micro-mitten
[INFO] finished tweaking git repo https://github.com/doctorn/micro-mitten
[INFO] tweaked toml for git repo https://github.com/doctorn/micro-mitten written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/doctorn/micro-mitten already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/TheDan64/inkwell`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded codespan-reporting v0.5.0
[INFO] [stderr]   Downloaded llvm-sys v80.1.2
[INFO] [stderr]   Downloaded codespan v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dedbefe2a7f02eae382e1813decca596e9bbc0acf80837abe06a64a38bee1be8
[INFO] running `Command { std: "docker" "start" "-a" "dedbefe2a7f02eae382e1813decca596e9bbc0acf80837abe06a64a38bee1be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dedbefe2a7f02eae382e1813decca596e9bbc0acf80837abe06a64a38bee1be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dedbefe2a7f02eae382e1813decca596e9bbc0acf80837abe06a64a38bee1be8", kill_on_drop: false }`
[INFO] [stdout] dedbefe2a7f02eae382e1813decca596e9bbc0acf80837abe06a64a38bee1be8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7a3b2872145934a4349ade73a71d6abd75bb6c60116df27f3d29976c4b1097d
[INFO] running `Command { std: "docker" "start" "-a" "e7a3b2872145934a4349ade73a71d6abd75bb6c60116df27f3d29976c4b1097d", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling cc v1.0.52
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]    Compiling syn v1.0.19
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking smallvec v1.4.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking termcolor v1.1.0
[INFO] [stderr]    Compiling inkwell v0.1.0 (https://github.com/TheDan64/inkwell?branch=llvm8-0#9aabeab2)
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]     Checking codespan v0.5.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking codespan-reporting v0.5.0
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]    Compiling llvm-sys v80.1.2
[INFO] [stderr]    Compiling inkwell_internals v0.1.0 (https://github.com/TheDan64/inkwell?branch=llvm8-0#9aabeab2)
[INFO] [stderr]     Checking micro_mitten v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary braces around `if` condition
[INFO] [stdout]    --> src/middle/analysis/mod.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |         if { self.cache.borrow().contains_key(&TypeId::of::<T>()) } {
[INFO] [stdout]     |            ^^                                                    ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 173 -         if { self.cache.borrow().contains_key(&TypeId::of::<T>()) } {
[INFO] [stdout] 173 +         if self.cache.borrow().contains_key(&TypeId::of::<T>()) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around `if` condition
[INFO] [stdout]    --> src/middle/analysis/mod.rs:173:12
[INFO] [stdout]     |
[INFO] [stdout] 173 |         if { self.cache.borrow().contains_key(&TypeId::of::<T>()) } {
[INFO] [stdout]     |            ^^                                                    ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 173 -         if { self.cache.borrow().contains_key(&TypeId::of::<T>()) } {
[INFO] [stdout] 173 +         if self.cache.borrow().contains_key(&TypeId::of::<T>()) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `sess` is never read
[INFO] [stdout]   --> src/middle/lowering/ty_ctx.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub(super) struct TyLoweringCtx<'ast> {
[INFO] [stdout]    |                   ------------- field in this struct
[INFO] [stdout] 11 |     sess: &'ast Opts,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TyLoweringCtx` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `def_idx` is never read
[INFO] [stdout]   --> src/middle/analysis/graph.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(super) struct ControlGraph {
[INFO] [stdout]    |                   ------------ field in this struct
[INFO] [stdout] 14 |     def_idx: ir::DefIdx,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ControlGraph` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `sess` is never read
[INFO] [stdout]   --> src/middle/lowering/ty_ctx.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub(super) struct TyLoweringCtx<'ast> {
[INFO] [stdout]    |                   ------------- field in this struct
[INFO] [stdout] 11 |     sess: &'ast Opts,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TyLoweringCtx` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `def_idx` is never read
[INFO] [stdout]   --> src/middle/analysis/graph.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub(super) struct ControlGraph {
[INFO] [stdout]    |                   ------------ field in this struct
[INFO] [stdout] 14 |     def_idx: ir::DefIdx,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ControlGraph` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 24.52s
[INFO] running `Command { std: "docker" "inspect" "e7a3b2872145934a4349ade73a71d6abd75bb6c60116df27f3d29976c4b1097d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7a3b2872145934a4349ade73a71d6abd75bb6c60116df27f3d29976c4b1097d", kill_on_drop: false }`
[INFO] [stdout] e7a3b2872145934a4349ade73a71d6abd75bb6c60116df27f3d29976c4b1097d