[INFO] cloning repository https://github.com/flake-lang/flake2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/flake-lang/flake2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflake-lang%2Fflake2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflake-lang%2Fflake2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2728b593aede27dd08770f7ee8553b3dd19dc098
[INFO] checking flake-lang/flake2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflake-lang%2Fflake2" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/flake-lang/flake2
[INFO] finished tweaking git repo https://github.com/flake-lang/flake2
[INFO] tweaked toml for git repo https://github.com/flake-lang/flake2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/flake-lang/flake2 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/flake-lang/flake2 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c55321134f66f45e716c181ce6c132d79e35ae127107971e04b456b3144f461c
[INFO] running `Command { std: "docker" "start" "-a" "c55321134f66f45e716c181ce6c132d79e35ae127107971e04b456b3144f461c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c55321134f66f45e716c181ce6c132d79e35ae127107971e04b456b3144f461c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c55321134f66f45e716c181ce6c132d79e35ae127107971e04b456b3144f461c", kill_on_drop: false }`
[INFO] [stdout] c55321134f66f45e716c181ce6c132d79e35ae127107971e04b456b3144f461c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 590f451b940dd69cfaef2c68a1f026cead6e5ba61f2abdaaf2fa8d79914d6491
[INFO] running `Command { std: "docker" "start" "-a" "590f451b940dd69cfaef2c68a1f026cead6e5ba61f2abdaaf2fa8d79914d6491", kill_on_drop: false }`
[INFO] [stderr]    Compiling lalr v0.0.2
[INFO] [stderr]    Compiling cc v1.0.88
[INFO] [stderr]    Compiling inkwell v0.4.0
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking lexgen_util v0.15.0
[INFO] [stderr]     Checking flakec-codegen v0.0.0 (/opt/rustwide/workdir/compiler/flakec-codegen)
[INFO] [stderr]    Compiling syn v2.0.52
[INFO] [stderr]    Compiling regex v1.10.3
[INFO] [stderr]     Checking proc-macro2 v1.0.78
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]    Compiling llvm-sys v140.1.3
[INFO] [stderr]     Checking flakec-parser-derive v0.1.0 (/opt/rustwide/workdir/compiler/flakec-parser-derive)
[INFO] [stdout] warning: unused import: `ToTokens as _`
[INFO] [stdout]  --> compiler/flakec-parser-derive/src/lib.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 | use quote::{quote, ToTokens as _};
[INFO] [stdout]   |                    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ToTokens as _`
[INFO] [stdout]  --> compiler/flakec-parser-derive/src/lib.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 | use quote::{quote, ToTokens as _};
[INFO] [stdout]   |                    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling lexgen v0.15.0
[INFO] [stderr]    Compiling plex v0.3.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling inkwell_internals v0.9.0
[INFO] [stderr]     Checking thiserror v1.0.57
[INFO] [stderr]     Checking flakec-lexer v0.0.0 (/opt/rustwide/workdir/compiler/flakec-lexer)
[INFO] [stdout] warning: unused imports: `str::Chars` and `string::ParseError`
[INFO] [stdout]  --> compiler/flakec-lexer/src/stream.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{convert::Infallible, str::Chars, string::ParseError};
[INFO] [stdout]   |                                ^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `str::Chars` and `string::ParseError`
[INFO] [stdout]  --> compiler/flakec-lexer/src/stream.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{convert::Infallible, str::Chars, string::ParseError};
[INFO] [stdout]   |                                ^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexer`
[INFO] [stdout]   --> compiler/flakec-lexer/src/stream.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Lexer,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexer`
[INFO] [stdout]   --> compiler/flakec-lexer/src/stream.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Lexer,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<TokenKind<'_>, Infallible>
[INFO] [stdout]    --> compiler/flakec-lexer/src/syn.rs:26:1
[INFO] [stdout]     |
[INFO] [stdout]  26 | / lexer! {
[INFO] [stdout]  27 | |     pub Lexer(LexerState) -> TokenKind<'input>;
[INFO] [stdout]  28 | |
[INFO] [stdout]  29 | |     let whitespace = [' ' '\t' '\n'] | "\r\n";
[INFO] [stdout] ...   |
[INFO] [stdout] 225 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]     = note: this error originates in the macro `lexer` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flakec-lexer` (lib) due to 1 previous error; 3 warnings emitted
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> compiler/flakec-lexer/src/token.rs:138:17
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub fn kind(&self) -> &TokenKind{
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^
[INFO] [stdout]     |                 |         ||
[INFO] [stdout]     |                 |         |the same lifetime is hidden here
[INFO] [stdout]     |                 |         the same lifetime is elided here
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub fn kind(&self) -> &TokenKind<'_>{
[INFO] [stdout]     |                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<TokenKind<'_>, Infallible>
[INFO] [stdout]    --> compiler/flakec-lexer/src/syn.rs:26:1
[INFO] [stdout]     |
[INFO] [stdout]  26 | / lexer! {
[INFO] [stdout]  27 | |     pub Lexer(LexerState) -> TokenKind<'input>;
[INFO] [stdout]  28 | |
[INFO] [stdout]  29 | |     let whitespace = [' ' '\t' '\n'] | "\r\n";
[INFO] [stdout] ...   |
[INFO] [stdout] 225 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]     = note: this error originates in the macro `lexer` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> compiler/flakec-lexer/src/token.rs:138:17
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub fn kind(&self) -> &TokenKind{
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^
[INFO] [stdout]     |                 |         ||
[INFO] [stdout]     |                 |         |the same lifetime is hidden here
[INFO] [stdout]     |                 |         the same lifetime is elided here
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub fn kind(&self) -> &TokenKind<'_>{
[INFO] [stdout]     |                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flakec-lexer` (lib test) due to 1 previous error; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "590f451b940dd69cfaef2c68a1f026cead6e5ba61f2abdaaf2fa8d79914d6491", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "590f451b940dd69cfaef2c68a1f026cead6e5ba61f2abdaaf2fa8d79914d6491", kill_on_drop: false }`
[INFO] [stdout] 590f451b940dd69cfaef2c68a1f026cead6e5ba61f2abdaaf2fa8d79914d6491