[INFO] updating cached repository https://github.com/strangelovephd/rusty_interpreter
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 422e6cf00cb9681f0b308a4a7c977f7d1bd733e2
[INFO] checking strangelovephd/rusty_interpreter against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstrangelovephd%2Frusty_interpreter" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/strangelovephd/rusty_interpreter on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/strangelovephd/rusty_interpreter
[INFO] finished tweaking git repo https://github.com/strangelovephd/rusty_interpreter
[INFO] tweaked toml for git repo https://github.com/strangelovephd/rusty_interpreter written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/strangelovephd/rusty_interpreter already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0e539e6abf6033e7ee72601e73765783806d2d587899c6149c794c36fdd0595c
[INFO] running `"docker" "start" "-a" "0e539e6abf6033e7ee72601e73765783806d2d587899c6149c794c36fdd0595c"`
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking rusty_interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: struct is never constructed: `LexerError`
[INFO] [stderr]  --> src/token.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct LexerError {
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Illegal`
[INFO] [stderr]   --> src/token.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Illegal(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `IllegalIdent`
[INFO] [stderr]   --> src/token.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     IllegalIdent(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Ident`
[INFO] [stderr]   --> src/token.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     Ident(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Int`
[INFO] [stderr]   --> src/token.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     Int(i32),
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `look_up_token`
[INFO] [stderr]   --> src/token.rs:63:8
[INFO] [stderr]    |
[INFO] [stderr] 63 | pub fn look_up_token(tok: &str) -> Option<TokenType> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/token.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     pub fn new(tt: TokenType, lit: String) -> Token {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `look_up_keyword`
[INFO] [stderr]    --> src/token.rs:101:8
[INFO] [stderr]     |
[INFO] [stderr] 101 | pub fn look_up_keyword(kw: &str) -> Option<Keyword> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `ILLEGAL`
[INFO] [stderr]    --> src/token.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     pub const ILLEGAL: &str = "ILLEGAL";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `EOF`
[INFO] [stderr]    --> src/token.rs:110:5
[INFO] [stderr]     |
[INFO] [stderr] 110 |     pub const EOF: &str = "EOF";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `IDENT`
[INFO] [stderr]    --> src/token.rs:113:5
[INFO] [stderr]     |
[INFO] [stderr] 113 |     pub const IDENT: &str = "IDENT";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `INT`
[INFO] [stderr]    --> src/token.rs:114:5
[INFO] [stderr]     |
[INFO] [stderr] 114 |     pub const INT: &str = "INT";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `ASSIGN`
[INFO] [stderr]    --> src/token.rs:117:5
[INFO] [stderr]     |
[INFO] [stderr] 117 |     pub const ASSIGN: &str = "=";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PLUS`
[INFO] [stderr]    --> src/token.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub const PLUS: &str = "+";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `COMMA`
[INFO] [stderr]    --> src/token.rs:121:5
[INFO] [stderr]     |
[INFO] [stderr] 121 |     pub const COMMA: &str = ",";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `SEMICOLON`
[INFO] [stderr]    --> src/token.rs:122:5
[INFO] [stderr]     |
[INFO] [stderr] 122 |     pub const SEMICOLON: &str = ";";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LPAREN`
[INFO] [stderr]    --> src/token.rs:125:5
[INFO] [stderr]     |
[INFO] [stderr] 125 |     pub const LPAREN: &str = "(";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `RPAREN`
[INFO] [stderr]    --> src/token.rs:126:5
[INFO] [stderr]     |
[INFO] [stderr] 126 |     pub const RPAREN: &str = ")";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LBRACE`
[INFO] [stderr]    --> src/token.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     pub const LBRACE: &str = "{";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `RBRACE`
[INFO] [stderr]    --> src/token.rs:128:5
[INFO] [stderr]     |
[INFO] [stderr] 128 |     pub const RBRACE: &str = "}";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `FUNCTION`
[INFO] [stderr]    --> src/token.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     pub const FUNCTION: &str = "FUNCTION";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LET`
[INFO] [stderr]    --> src/token.rs:132:5
[INFO] [stderr]     |
[INFO] [stderr] 132 |     pub const LET: &str = "LET";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Lexer`
[INFO] [stderr]  --> src/lexer.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Lexer {
[INFO] [stderr]   |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/lexer.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub fn new(i: Vec<u8>) -> Lexer {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_char`
[INFO] [stderr]   --> src/lexer.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn read_char(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token`
[INFO] [stderr]   --> src/lexer.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     pub fn next_token(&mut self) -> TokenType {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_letter`
[INFO] [stderr]    --> src/lexer.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 |     fn is_letter(ch: &u8) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_char`
[INFO] [stderr]    --> src/lexer.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     fn is_char(ch: &char) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_identifier`
[INFO] [stderr]    --> src/lexer.rs:113:5
[INFO] [stderr]     |
[INFO] [stderr] 113 |     fn read_identifier(&mut self) -> String {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `skip_whitespace`
[INFO] [stderr]    --> src/lexer.rs:124:5
[INFO] [stderr]     |
[INFO] [stderr] 124 |     fn skip_whitespace(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_number`
[INFO] [stderr]    --> src/lexer.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     fn read_number(&mut self) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_digit`
[INFO] [stderr]    --> src/lexer.rs:146:5
[INFO] [stderr]     |
[INFO] [stderr] 146 |     fn is_digit(byte: &char) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tests`
[INFO] [stderr]    --> src/token.rs:140:13
[INFO] [stderr]     |
[INFO] [stderr] 140 |         let tests: Vec<&str> = vec![
[INFO] [stderr]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_tests`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 32 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LexerError`
[INFO] [stderr]  --> src/token.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct LexerError {
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `IllegalIdent`
[INFO] [stderr]   --> src/token.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     IllegalIdent(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `ILLEGAL`
[INFO] [stderr]    --> src/token.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     pub const ILLEGAL: &str = "ILLEGAL";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `EOF`
[INFO] [stderr]    --> src/token.rs:110:5
[INFO] [stderr]     |
[INFO] [stderr] 110 |     pub const EOF: &str = "EOF";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `IDENT`
[INFO] [stderr]    --> src/token.rs:113:5
[INFO] [stderr]     |
[INFO] [stderr] 113 |     pub const IDENT: &str = "IDENT";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `INT`
[INFO] [stderr]    --> src/token.rs:114:5
[INFO] [stderr]     |
[INFO] [stderr] 114 |     pub const INT: &str = "INT";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `ASSIGN`
[INFO] [stderr]    --> src/token.rs:117:5
[INFO] [stderr]     |
[INFO] [stderr] 117 |     pub const ASSIGN: &str = "=";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PLUS`
[INFO] [stderr]    --> src/token.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub const PLUS: &str = "+";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `COMMA`
[INFO] [stderr]    --> src/token.rs:121:5
[INFO] [stderr]     |
[INFO] [stderr] 121 |     pub const COMMA: &str = ",";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `SEMICOLON`
[INFO] [stderr]    --> src/token.rs:122:5
[INFO] [stderr]     |
[INFO] [stderr] 122 |     pub const SEMICOLON: &str = ";";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LPAREN`
[INFO] [stderr]    --> src/token.rs:125:5
[INFO] [stderr]     |
[INFO] [stderr] 125 |     pub const LPAREN: &str = "(";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `RPAREN`
[INFO] [stderr]    --> src/token.rs:126:5
[INFO] [stderr]     |
[INFO] [stderr] 126 |     pub const RPAREN: &str = ")";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LBRACE`
[INFO] [stderr]    --> src/token.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     pub const LBRACE: &str = "{";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `RBRACE`
[INFO] [stderr]    --> src/token.rs:128:5
[INFO] [stderr]     |
[INFO] [stderr] 128 |     pub const RBRACE: &str = "}";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `FUNCTION`
[INFO] [stderr]    --> src/token.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     pub const FUNCTION: &str = "FUNCTION";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LET`
[INFO] [stderr]    --> src/token.rs:132:5
[INFO] [stderr]     |
[INFO] [stderr] 132 |     pub const LET: &str = "LET";
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_letter`
[INFO] [stderr]    --> src/lexer.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 |     fn is_letter(ch: &u8) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `"docker" "inspect" "0e539e6abf6033e7ee72601e73765783806d2d587899c6149c794c36fdd0595c"`
[INFO] running `"docker" "rm" "-f" "0e539e6abf6033e7ee72601e73765783806d2d587899c6149c794c36fdd0595c"`
[INFO] [stdout] 0e539e6abf6033e7ee72601e73765783806d2d587899c6149c794c36fdd0595c