[INFO] cloning repository https://github.com/gnamikawa/sigmorph
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gnamikawa/sigmorph" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgnamikawa%2Fsigmorph", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgnamikawa%2Fsigmorph'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 352c538ab5b3a9f336ff37c0ebff3d10327fd6d1
[INFO] checking gnamikawa/sigmorph against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgnamikawa%2Fsigmorph" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gnamikawa/sigmorph on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gnamikawa/sigmorph
[INFO] finished tweaking git repo https://github.com/gnamikawa/sigmorph
[INFO] tweaked toml for git repo https://github.com/gnamikawa/sigmorph written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/gnamikawa/sigmorph 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thiserror-impl v1.0.47
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[INFO] [stderr]   Downloaded semver v1.0.18
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] afcf84de38b2b25ec47abe7ac4dbceb30d49d384104f2f63bbd828adc09977c2
[INFO] running `Command { std: "docker" "start" "-a" "afcf84de38b2b25ec47abe7ac4dbceb30d49d384104f2f63bbd828adc09977c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "afcf84de38b2b25ec47abe7ac4dbceb30d49d384104f2f63bbd828adc09977c2", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling rustix v0.38.8
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[INFO] [stderr]    Compiling aho-corasick v1.0.4
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[INFO] [stderr]    Compiling anyhow v1.0.75
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[INFO] [stderr]     Checking sigmorph v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `NUMERIC_LITERAL` should have an upper camel case name
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     NUMERIC_LITERAL,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `NumericLiteral`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `NUMERIC_LITERAL` should have an upper camel case name
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     NUMERIC_LITERAL,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `NumericLiteral`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:144:21
[INFO] [stdout]     |
[INFO] [stdout] 144 |                 _ | '/' => {
[INFO] [stdout]     |                     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tokens`
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:139:5
[INFO] [stdout]     |
[INFO] [stdout] 139 |     tokens: &mut Vec<Token>,
[INFO] [stdout]     |     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tokens`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `IDENTIFIER`, `KEYWORD`, `SEMICOLON`, `ASSIGNMENT`, `NUMERIC_LITERAL`, and `EXPRESSION` are never constructed
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub enum TokenType {
[INFO] [stdout]    |          --------- variants in this enum
[INFO] [stdout] 15 |     IDENTIFIER,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 16 |     KEYWORD,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 17 |     SEMICOLON,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 18 |     ASSIGNMENT,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 19 |     NUMERIC_LITERAL,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 20 |     EXPRESSION,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TokenType` 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: fields `line_number` and `char_number` are never read
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct TokenMetadata {
[INFO] [stdout]    |            ------------- fields in this struct
[INFO] [stdout] 25 |     line_number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 26 |     char_number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TokenMetadata` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `lexeme`, `token_type`, and `metadata` are never read
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Token {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 31 |     lexeme: Lexeme,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 32 |     token_type: Option<TokenType>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 33 |     metadata: TokenMetadata,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Token` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `UnexpectedDeclaration` is never constructed
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub enum LexerError {
[INFO] [stdout]    |          ---------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 44 |     UnexpectedDeclaration,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LexerError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `declaration` is never used
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:176:4
[INFO] [stdout]     |
[INFO] [stdout] 176 | fn declaration<I: Iterator<Item = char>>(
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `identifier` is never used
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:210:4
[INFO] [stdout]     |
[INFO] [stdout] 210 | fn identifier<I: Iterator<Item = char>>(
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]  --> src/compiler/parser/mod.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn parse() {}
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:144:21
[INFO] [stdout]     |
[INFO] [stdout] 144 |                 _ | '/' => {
[INFO] [stdout]     |                     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tokens`
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:139:5
[INFO] [stdout]     |
[INFO] [stdout] 139 |     tokens: &mut Vec<Token>,
[INFO] [stdout]     |     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tokens`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `IDENTIFIER`, `KEYWORD`, `SEMICOLON`, `ASSIGNMENT`, `NUMERIC_LITERAL`, and `EXPRESSION` are never constructed
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub enum TokenType {
[INFO] [stdout]    |          --------- variants in this enum
[INFO] [stdout] 15 |     IDENTIFIER,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 16 |     KEYWORD,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 17 |     SEMICOLON,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 18 |     ASSIGNMENT,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 19 |     NUMERIC_LITERAL,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 20 |     EXPRESSION,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TokenType` 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: fields `line_number` and `char_number` are never read
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct TokenMetadata {
[INFO] [stdout]    |            ------------- fields in this struct
[INFO] [stdout] 25 |     line_number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 26 |     char_number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TokenMetadata` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `lexeme`, `token_type`, and `metadata` are never read
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Token {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 31 |     lexeme: Lexeme,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 32 |     token_type: Option<TokenType>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 33 |     metadata: TokenMetadata,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Token` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `UnexpectedDeclaration` is never constructed
[INFO] [stdout]   --> src/compiler/lexer/mod.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub enum LexerError {
[INFO] [stdout]    |          ---------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 44 |     UnexpectedDeclaration,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LexerError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `declaration` is never used
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:176:4
[INFO] [stdout]     |
[INFO] [stdout] 176 | fn declaration<I: Iterator<Item = char>>(
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `identifier` is never used
[INFO] [stdout]    --> src/compiler/lexer/mod.rs:210:4
[INFO] [stdout]     |
[INFO] [stdout] 210 | fn identifier<I: Iterator<Item = char>>(
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]  --> src/compiler/parser/mod.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn parse() {}
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.03s
[INFO] running `Command { std: "docker" "inspect" "ac0991054a0db2ec08fb17efb4f8ce58b11b651724d2f5d526da253dc95be58c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac0991054a0db2ec08fb17efb4f8ce58b11b651724d2f5d526da253dc95be58c", kill_on_drop: false }`
[INFO] [stdout] ac0991054a0db2ec08fb17efb4f8ce58b11b651724d2f5d526da253dc95be58c