[INFO] cloning repository https://github.com/ElijahAhianyo/xxm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ElijahAhianyo/xxm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FElijahAhianyo%2Fxxm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FElijahAhianyo%2Fxxm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 03b4bd5c9fe869a254b6071c140a07d54ee78a92
[INFO] checking ElijahAhianyo/xxm 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%2FElijahAhianyo%2Fxxm" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ElijahAhianyo/xxm
[INFO] finished tweaking git repo https://github.com/ElijahAhianyo/xxm
[INFO] tweaked toml for git repo https://github.com/ElijahAhianyo/xxm written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ElijahAhianyo/xxm 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/ElijahAhianyo/xxm 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 9ef8c68304d9a220712ea28ab6d15685ef2dcd0174f6c3e4ff34def8eccc0d0f
[INFO] running `Command { std: "docker" "start" "-a" "9ef8c68304d9a220712ea28ab6d15685ef2dcd0174f6c3e4ff34def8eccc0d0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ef8c68304d9a220712ea28ab6d15685ef2dcd0174f6c3e4ff34def8eccc0d0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ef8c68304d9a220712ea28ab6d15685ef2dcd0174f6c3e4ff34def8eccc0d0f", kill_on_drop: false }`
[INFO] [stdout] 9ef8c68304d9a220712ea28ab6d15685ef2dcd0174f6c3e4ff34def8eccc0d0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 0ec57b68baa3dd4af6aea2be080ace1e04b43f5e08b1eeb9f67c992a43f28fa2
[INFO] running `Command { std: "docker" "start" "-a" "0ec57b68baa3dd4af6aea2be080ace1e04b43f5e08b1eeb9f67c992a43f28fa2", kill_on_drop: false }`
[INFO] [stderr]    Compiling thiserror-impl v2.0.16
[INFO] [stderr]     Checking thiserror v2.0.16
[INFO] [stderr]     Checking xxm v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `peek_next` is never used
[INFO] [stdout]   --> src/lexer/lexer.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl Lexer {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 91 |     fn peek_next(&self) -> char {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `String` is never constructed
[INFO] [stdout]   --> src/token.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout]  2 | pub enum TokenKind {
[INFO] [stdout]    |          --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 14 |     String,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TokenKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Nil` is never constructed
[INFO] [stdout]   --> src/token.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub enum Object {
[INFO] [stdout]    |          ------ variant in this enum
[INFO] [stdout] 61 |     Num(u32),
[INFO] [stdout] 62 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Object` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `kind`, `lexeme`, `literal`, and `line` are never used
[INFO] [stdout]   --> src/token.rs:83:12
[INFO] [stdout]    |
[INFO] [stdout] 73 | impl Token {
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 83 |     pub fn kind(&self) -> &TokenKind {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 87 |     pub fn lexeme(&self) -> &String {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 91 |     pub fn literal(&self) -> &Option<Object> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 95 |     pub fn line(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/lib.rs:28:40
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let bytes = fs::read_to_string(PathBuf::from_str(str_path).expect("invalid path"))?;
[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: std::result::Result<&Vec<Token>, LexError>
[INFO] [stdout]   --> src/lib.rs:35:22
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let tokens = lexer.scan_tokens().unwrap();
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<&Vec<Token>, LexError>
[INFO] [stdout]   --> src/lexer/lexer.rs:28:58
[INFO] [stdout]    |
[INFO] [stdout] 28 |       pub fn scan_tokens(&mut self) -> Result<&Vec<Token>> {
[INFO] [stdout]    |  __________________________________________________________^
[INFO] [stdout] 29 | |         println!("scanning source: {:?}", self.source);
[INFO] [stdout] 30 | |         while !self.is_at_end() {
[INFO] [stdout] 31 | |             self.scan_token();
[INFO] [stdout] ...  |
[INFO] [stdout] 34 | |         Ok(&self.tokens)
[INFO] [stdout] 35 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<&Vec<Token>, LexError>
[INFO] [stdout]   --> src/lexer/lexer.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Ok(&self.tokens)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xxm` (lib test) due to 4 previous errors; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: method `peek_next` is never used
[INFO] [stdout]   --> src/lexer/lexer.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl Lexer {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 91 |     fn peek_next(&self) -> char {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `String` is never constructed
[INFO] [stdout]   --> src/token.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout]  2 | pub enum TokenKind {
[INFO] [stdout]    |          --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 14 |     String,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TokenKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Nil` is never constructed
[INFO] [stdout]   --> src/token.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub enum Object {
[INFO] [stdout]    |          ------ variant in this enum
[INFO] [stdout] 61 |     Num(u32),
[INFO] [stdout] 62 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Object` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `kind`, `lexeme`, `literal`, and `line` are never used
[INFO] [stdout]   --> src/token.rs:83:12
[INFO] [stdout]    |
[INFO] [stdout] 73 | impl Token {
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 83 |     pub fn kind(&self) -> &TokenKind {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 87 |     pub fn lexeme(&self) -> &String {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 91 |     pub fn literal(&self) -> &Option<Object> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 95 |     pub fn line(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/lib.rs:28:40
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let bytes = fs::read_to_string(PathBuf::from_str(str_path).expect("invalid path"))?;
[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: std::result::Result<&Vec<Token>, LexError>
[INFO] [stdout]   --> src/lib.rs:35:22
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let tokens = lexer.scan_tokens().unwrap();
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<&Vec<Token>, LexError>
[INFO] [stdout]   --> src/lexer/lexer.rs:28:58
[INFO] [stdout]    |
[INFO] [stdout] 28 |       pub fn scan_tokens(&mut self) -> Result<&Vec<Token>> {
[INFO] [stdout]    |  __________________________________________________________^
[INFO] [stdout] 29 | |         println!("scanning source: {:?}", self.source);
[INFO] [stdout] 30 | |         while !self.is_at_end() {
[INFO] [stdout] 31 | |             self.scan_token();
[INFO] [stdout] ...  |
[INFO] [stdout] 34 | |         Ok(&self.tokens)
[INFO] [stdout] 35 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<&Vec<Token>, LexError>
[INFO] [stdout]   --> src/lexer/lexer.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Ok(&self.tokens)
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xxm` (lib) due to 4 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "0ec57b68baa3dd4af6aea2be080ace1e04b43f5e08b1eeb9f67c992a43f28fa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ec57b68baa3dd4af6aea2be080ace1e04b43f5e08b1eeb9f67c992a43f28fa2", kill_on_drop: false }`
[INFO] [stdout] 0ec57b68baa3dd4af6aea2be080ace1e04b43f5e08b1eeb9f67c992a43f28fa2