[INFO] fetching crate forth-lexer 0.1.1...
[INFO] checking forth-lexer-0.1.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate forth-lexer 0.1.1 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate forth-lexer 0.1.1
[INFO] finished tweaking crates.io crate forth-lexer 0.1.1
[INFO] tweaked toml for crates.io crate forth-lexer 0.1.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate forth-lexer 0.1.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] [stderr]       Adding nom v7.1.3 (available: v8.0.0)
[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] 60e2ac453f991e14d524b5ed1363757324a1da51224b615db49ed3e97dc018ad
[INFO] running `Command { std: "docker" "start" "-a" "60e2ac453f991e14d524b5ed1363757324a1da51224b615db49ed3e97dc018ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "60e2ac453f991e14d524b5ed1363757324a1da51224b615db49ed3e97dc018ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60e2ac453f991e14d524b5ed1363757324a1da51224b615db49ed3e97dc018ad", kill_on_drop: false }`
[INFO] [stdout] 60e2ac453f991e14d524b5ed1363757324a1da51224b615db49ed3e97dc018ad
[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] f7957bb1915591f27003674298427a148d0791ca9427d8ebe81ce05f8996b299
[INFO] running `Command { std: "docker" "start" "-a" "f7957bb1915591f27003674298427a148d0791ca9427d8ebe81ce05f8996b299", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.100
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]     Checking forth-lexer v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: irrefutable `while let` pattern
[INFO] [stdout]    --> src/parser.rs:240:15
[INFO] [stdout]     |
[INFO] [stdout] 240 |         while let Ok(tok) = self.next_token() {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the loop will never exit
[INFO] [stdout]     = help: consider instead using a `loop { ... }` with a `let` inside it
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Token, LexError>
[INFO] [stdout]    --> src/parser.rs:46:61
[INFO] [stdout]     |
[INFO] [stdout]  46 |       pub fn next_token(&mut self) -> Result<Token, LexError> {
[INFO] [stdout]     |  _____________________________________________________________^
[INFO] [stdout]  47 | |         self.skip_whitespace();
[INFO] [stdout]  48 | |
[INFO] [stdout]  49 | |         let tok = match self.ch {
[INFO] [stdout] ...   |
[INFO] [stdout] 156 | |         Ok(tok)
[INFO] [stdout] 157 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Token, LexError>
[INFO] [stdout]    --> src/parser.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |         Ok(tok)
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Token, LexError>
[INFO] [stdout]    --> src/parser.rs:240:29
[INFO] [stdout]     |
[INFO] [stdout] 240 |         while let Ok(tok) = self.next_token() {
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `forth-lexer` (lib) due to 3 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: irrefutable `while let` pattern
[INFO] [stdout]    --> src/parser.rs:240:15
[INFO] [stdout]     |
[INFO] [stdout] 240 |         while let Ok(tok) = self.next_token() {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the loop will never exit
[INFO] [stdout]     = help: consider instead using a `loop { ... }` with a `let` inside it
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<token::Token, LexError>
[INFO] [stdout]    --> src/parser.rs:46:61
[INFO] [stdout]     |
[INFO] [stdout]  46 |       pub fn next_token(&mut self) -> Result<Token, LexError> {
[INFO] [stdout]     |  _____________________________________________________________^
[INFO] [stdout]  47 | |         self.skip_whitespace();
[INFO] [stdout]  48 | |
[INFO] [stdout]  49 | |         let tok = match self.ch {
[INFO] [stdout] ...   |
[INFO] [stdout] 156 | |         Ok(tok)
[INFO] [stdout] 157 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<token::Token, LexError>
[INFO] [stdout]    --> src/parser.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |         Ok(tok)
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<token::Token, LexError>
[INFO] [stdout]    --> src/parser.rs:240:29
[INFO] [stdout]     |
[INFO] [stdout] 240 |         while let Ok(tok) = self.next_token() {
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `forth-lexer` (lib test) due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "f7957bb1915591f27003674298427a148d0791ca9427d8ebe81ce05f8996b299", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7957bb1915591f27003674298427a148d0791ca9427d8ebe81ce05f8996b299", kill_on_drop: false }`
[INFO] [stdout] f7957bb1915591f27003674298427a148d0791ca9427d8ebe81ce05f8996b299
