[INFO] fetching crate regalloc 0.0.34...
[INFO] checking regalloc-0.0.34 against master#17ffbc81a30c094193836a5d7f90dff273b5df93 for pr-138785
[INFO] extracting crate regalloc 0.0.34 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate regalloc 0.0.34 on toolchain 17ffbc81a30c094193836a5d7f90dff273b5df93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+17ffbc81a30c094193836a5d7f90dff273b5df93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate regalloc 0.0.34
[INFO] finished tweaking crates.io crate regalloc 0.0.34
[INFO] tweaked toml for crates.io crate regalloc 0.0.34 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+17ffbc81a30c094193836a5d7f90dff273b5df93" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 9 packages to latest compatible versions
[INFO] [stderr]       Adding rustc-hash v1.1.0 (available: v2.1.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+17ffbc81a30c094193836a5d7f90dff273b5df93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+17ffbc81a30c094193836a5d7f90dff273b5df93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b396262b5126a1f5528b06b5ecd3874e5c53ee0272f73610da17fbca63b77ae9
[INFO] running `Command { std: "docker" "start" "-a" "b396262b5126a1f5528b06b5ecd3874e5c53ee0272f73610da17fbca63b77ae9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b396262b5126a1f5528b06b5ecd3874e5c53ee0272f73610da17fbca63b77ae9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b396262b5126a1f5528b06b5ecd3874e5c53ee0272f73610da17fbca63b77ae9", kill_on_drop: false }`
[INFO] [stdout] b396262b5126a1f5528b06b5ecd3874e5c53ee0272f73610da17fbca63b77ae9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+17ffbc81a30c094193836a5d7f90dff273b5df93" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5c2b676f7f7aa066d10d0492e7b645be674f9540118526d1030dca8d2405556d
[INFO] running `Command { std: "docker" "start" "-a" "5c2b676f7f7aa066d10d0492e7b645be674f9540118526d1030dca8d2405556d", kill_on_drop: false }`
[INFO] [stderr]     Checking log v0.4.27
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking smallvec v1.15.0
[INFO] [stderr]     Checking regalloc v0.0.34 (/opt/rustwide/workdir)
[INFO] [stdout] warning: elided lifetime has a name
[INFO] [stdout]    --> src/linear_scan/assign_registers.rs:285:49
[INFO] [stdout]     |
[INFO] [stdout] 285 |     fn iter<'a>(&'a self) -> RegisterMappingIter<T> {
[INFO] [stdout]     |             -- lifetime `'a` declared here      ^ this elided lifetime gets resolved as `'a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(elided_named_lifetimes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: elided lifetime has a name
[INFO] [stdout]    --> src/linear_scan/assign_registers.rs:285:49
[INFO] [stdout]     |
[INFO] [stdout] 285 |     fn iter<'a>(&'a self) -> RegisterMappingIter<T> {
[INFO] [stdout]     |             -- lifetime `'a` declared here      ^ this elided lifetime gets resolved as `'a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(elided_named_lifetimes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linear_scan/resolve_moves.rs:679:33
[INFO] [stdout]     |
[INFO] [stdout] 679 |                     if let Some(mut cycled) = find_cycled_move(stack, &mut stack_cur, blocking) {
[INFO] [stdout]     |                                 ----^^^^^^
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/linear_scan/resolve_moves.rs:679:33
[INFO] [stdout]     |
[INFO] [stdout] 679 |                     if let Some(mut cycled) = find_cycled_move(stack, &mut stack_cur, blocking) {
[INFO] [stdout]     |                                 ----^^^^^^
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `vreg` is never read
[INFO] [stdout]   --> src/snapshot.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |     Spill { vreg: Option<VirtualReg> },
[INFO] [stdout]    |     -----   ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IRInstKind` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `vreg` is never read
[INFO] [stdout]   --> src/snapshot.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 |     Reload { vreg: Option<VirtualReg> },
[INFO] [stdout]    |     ------   ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IRInstKind` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `vreg` is never read
[INFO] [stdout]   --> src/snapshot.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     Move { vreg: VirtualReg },
[INFO] [stdout]    |     ----   ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IRInstKind` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `vreg` is never read
[INFO] [stdout]   --> src/snapshot.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |     Spill { vreg: Option<VirtualReg> },
[INFO] [stdout]    |     -----   ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IRInstKind` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `vreg` is never read
[INFO] [stdout]   --> src/snapshot.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 21 |     Reload { vreg: Option<VirtualReg> },
[INFO] [stdout]    |     ------   ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IRInstKind` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `vreg` is never read
[INFO] [stdout]   --> src/snapshot.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     Move { vreg: VirtualReg },
[INFO] [stdout]    |     ----   ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IRInstKind` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.14s
[INFO] running `Command { std: "docker" "inspect" "5c2b676f7f7aa066d10d0492e7b645be674f9540118526d1030dca8d2405556d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c2b676f7f7aa066d10d0492e7b645be674f9540118526d1030dca8d2405556d", kill_on_drop: false }`
[INFO] [stdout] 5c2b676f7f7aa066d10d0492e7b645be674f9540118526d1030dca8d2405556d