[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 against try#9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869 for pr-129249
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdoctorn%2Fmicro-mitten" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/doctorn/micro-mitten on toolchain 9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "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-tc2/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" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "fetch" "--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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0ec7a593cf66e1fa1ba082f6d76f472fa7aaaf765bca0815b0c88357bfffb40e
[INFO] running `Command { std: "docker" "start" "-a" "0ec7a593cf66e1fa1ba082f6d76f472fa7aaaf765bca0815b0c88357bfffb40e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ec7a593cf66e1fa1ba082f6d76f472fa7aaaf765bca0815b0c88357bfffb40e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ec7a593cf66e1fa1ba082f6d76f472fa7aaaf765bca0815b0c88357bfffb40e", kill_on_drop: false }`
[INFO] [stdout] 0ec7a593cf66e1fa1ba082f6d76f472fa7aaaf765bca0815b0c88357bfffb40e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bf9eaa6614db031603262796b2c4327a27961aaf1010b77f705767d858e4b329
[INFO] running `Command { std: "docker" "start" "-a" "bf9eaa6614db031603262796b2c4327a27961aaf1010b77f705767d858e4b329", 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 v1.0.12
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling cc v1.0.52
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling syn v1.0.19
[INFO] [stderr]    Compiling aho-corasick v0.7.10
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking smallvec v1.4.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking termcolor v1.1.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]    Compiling inkwell v0.1.0 (https://github.com/TheDan64/inkwell?branch=llvm8-0#9aabeab2)
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking codespan v0.5.0
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]     Checking codespan-reporting v0.5.0
[INFO] [stderr]    Compiling regex v1.3.7
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling llvm-sys v80.1.2
[INFO] [stderr]     Checking structopt v0.2.18
[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] error: this conversion is useless `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Context>>` to `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Context>>`
[INFO] [stdout]    --> src/middle/analysis/mod.rs:232:20
[INFO] [stdout]     |
[INFO] [stdout] 232 |             guard: self.contexts.borrow().into(),
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(self_type_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this conversion is useless `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Summary>>` to `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Summary>>`
[INFO] [stdout]    --> src/middle/analysis/mod.rs:251:20
[INFO] [stdout]     |
[INFO] [stdout] 251 |             guard: self.summaries.borrow().into(),
[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] error: this conversion is useless `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Context>>` to `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Context>>`
[INFO] [stdout]    --> src/middle/analysis/mod.rs:232:20
[INFO] [stdout]     |
[INFO] [stdout] 232 |             guard: self.contexts.borrow().into(),
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(self_type_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this conversion is useless `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Summary>>` to `Ref<'_, idx_vec::IdxVec<DefIdx, <T as DataFlow>::Summary>>`
[INFO] [stdout]    --> src/middle/analysis/mod.rs:251:20
[INFO] [stdout]     |
[INFO] [stdout] 251 |             guard: self.summaries.borrow().into(),
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `micro_mitten` (lib) due to 2 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `micro_mitten` (lib test) due to 2 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "bf9eaa6614db031603262796b2c4327a27961aaf1010b77f705767d858e4b329", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf9eaa6614db031603262796b2c4327a27961aaf1010b77f705767d858e4b329", kill_on_drop: false }`
[INFO] [stdout] bf9eaa6614db031603262796b2c4327a27961aaf1010b77f705767d858e4b329