[INFO] cloning repository https://github.com/haumea-lang/haumea-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/haumea-lang/haumea-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaumea-lang%2Fhaumea-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaumea-lang%2Fhaumea-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b50ebe11ad0ec2e2b702016790b48c09c3950761
[INFO] testing haumea-lang/haumea-rs against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaumea-lang%2Fhaumea-rs" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/haumea-lang/haumea-rs on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/haumea-lang/haumea-rs
[INFO] finished tweaking git repo https://github.com/haumea-lang/haumea-rs
[INFO] tweaked toml for git repo https://github.com/haumea-lang/haumea-rs written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/haumea-lang/haumea-rs 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e8aa2f53372cf77ad11bd49dc03ebc75b1143756569131a88a821a4dd697800a
[INFO] running `Command { std: "docker" "start" "-a" "e8aa2f53372cf77ad11bd49dc03ebc75b1143756569131a88a821a4dd697800a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e8aa2f53372cf77ad11bd49dc03ebc75b1143756569131a88a821a4dd697800a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8aa2f53372cf77ad11bd49dc03ebc75b1143756569131a88a821a4dd697800a", kill_on_drop: false }`
[INFO] [stdout] e8aa2f53372cf77ad11bd49dc03ebc75b1143756569131a88a821a4dd697800a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 472773cda18155ede6de9363b82d41fa420d9908eff0c3b9a30036918335b298
[INFO] running `Command { std: "docker" "start" "-a" "472773cda18155ede6de9363b82d41fa420d9908eff0c3b9a30036918335b298", kill_on_drop: false }`
[INFO] [stderr]    Compiling haumea v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:179:16
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn match_token(mut token_stream: &mut Vec<Token>, expected: &Token) -> Result<Token, Token> {
[INFO] [stdout]     |                ----^^^^^^^^^^^^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:339:18
[INFO] [stdout]     |
[INFO] [stdout] 339 | fn parse_declare(mut token_stream: &mut Vec<Token>) -> Statement {
[INFO] [stdout]     |                  ----^^^^^^^^^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/parser.rs:191:26
[INFO] [stdout]     |
[INFO] [stdout] 191 |         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 191 -         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stdout] 191 +         Err(t) => panic!("Expected {:?}, but found {:?}!", expected, t),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `Command { std: "docker" "inspect" "472773cda18155ede6de9363b82d41fa420d9908eff0c3b9a30036918335b298", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "472773cda18155ede6de9363b82d41fa420d9908eff0c3b9a30036918335b298", kill_on_drop: false }`
[INFO] [stdout] 472773cda18155ede6de9363b82d41fa420d9908eff0c3b9a30036918335b298
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 739fda4dff7f479befc196f3b14814489496a6b6796326886479580643156c87
[INFO] running `Command { std: "docker" "start" "-a" "739fda4dff7f479befc196f3b14814489496a6b6796326886479580643156c87", kill_on_drop: false }`
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:179:16
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn match_token(mut token_stream: &mut Vec<Token>, expected: &Token) -> Result<Token, Token> {
[INFO] [stdout]     |                ----^^^^^^^^^^^^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:339:18
[INFO] [stdout]     |
[INFO] [stdout] 339 | fn parse_declare(mut token_stream: &mut Vec<Token>) -> Statement {
[INFO] [stdout]     |                  ----^^^^^^^^^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling haumea v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/parser.rs:191:26
[INFO] [stdout]     |
[INFO] [stdout] 191 |         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 191 -         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stdout] 191 +         Err(t) => panic!("Expected {:?}, but found {:?}!", expected, t),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:179:16
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn match_token(mut token_stream: &mut Vec<Token>, expected: &Token) -> Result<Token, Token> {
[INFO] [stdout]     |                ----^^^^^^^^^^^^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:339:18
[INFO] [stdout]     |
[INFO] [stdout] 339 | fn parse_declare(mut token_stream: &mut Vec<Token>) -> Statement {
[INFO] [stdout]     |                  ----^^^^^^^^^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/parser.rs:191:26
[INFO] [stdout]     |
[INFO] [stdout] 191 |         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 191 -         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stdout] 191 +         Err(t) => panic!("Expected {:?}, but found {:?}!", expected, t),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "739fda4dff7f479befc196f3b14814489496a6b6796326886479580643156c87", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "739fda4dff7f479befc196f3b14814489496a6b6796326886479580643156c87", kill_on_drop: false }`
[INFO] [stdout] 739fda4dff7f479befc196f3b14814489496a6b6796326886479580643156c87
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6d3ed4e535f1d1c060e04fe6924b01f8ca69d99d04a47eb9eabc7f138169d762
[INFO] running `Command { std: "docker" "start" "-a" "6d3ed4e535f1d1c060e04fe6924b01f8ca69d99d04a47eb9eabc7f138169d762", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parser.rs:179:16
[INFO] [stderr]     |
[INFO] [stderr] 179 | fn match_token(mut token_stream: &mut Vec<Token>, expected: &Token) -> Result<Token, Token> {
[INFO] [stderr]     |                ----^^^^^^^^^^^^
[INFO] [stderr]     |                |
[INFO] [stderr]     |                help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parser.rs:339:18
[INFO] [stderr]     |
[INFO] [stderr] 339 | fn parse_declare(mut token_stream: &mut Vec<Token>) -> Statement {
[INFO] [stderr]     |                  ----^^^^^^^^^^^^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/parser.rs:191:26
[INFO] [stderr]     |
[INFO] [stderr] 191 |         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stderr]     = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stderr]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stderr] help: remove the `format!(..)` macro call
[INFO] [stderr]     |
[INFO] [stderr] 191 -         Err(t) => panic!(format!("Expected {:?}, but found {:?}!", expected, t)),
[INFO] [stderr] 191 +         Err(t) => panic!("Expected {:?}, but found {:?}!", expected, t),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `haumea` (lib) generated 3 warnings (run `cargo fix --lib -p haumea` to apply 3 suggestions)
[INFO] [stderr] warning: `haumea` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/haumea-2a915f8f4f7fefef)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/haumea-b101fc589c0641c4)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/test_codegen.rs (/opt/rustwide/target/debug/deps/test_codegen-693efff4bcf19ee8)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stderr]      Running tests/test_parser.rs (/opt/rustwide/target/debug/deps/test_parser-0431a6ee37c04d69)
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_display_addition ... ok
[INFO] [stderr]      Running tests/test_scanner.rs (/opt/rustwide/target/debug/deps/test_scanner-a8470e8647801ac1)
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test test_scanner_simple ... ok
[INFO] [stdout] test test_keywords ... ok
[INFO] [stdout] test test_comments ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests haumea
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/scanner.rs - scanner::Scanner<'a>::next (line 325) ... FAILED
[INFO] [stdout] test src/scanner.rs - scanner::Scanner<'a>::new (line 126) ... ok
[INFO] [stdout] test src/scanner.rs - scanner::Scanner<'a>::next_token (line 156) ... ok
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/scanner.rs - scanner::Scanner<'a>::next (line 325) stdout ----
[INFO] [stdout] error[E0596]: cannot borrow `s` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/scanner.rs:328:6
[INFO] [stdout]    |
[INFO] [stdout] 6  |  let s = Scanner::new("1 + 1");
[INFO] [stdout]    |      ^ not mutable
[INFO] [stdout] 7  |  assert_eq!(s.next(), Some(Token::Number(1, ScanState::empty())));
[INFO] [stdout]    |             - cannot borrow as mutable
[INFO] [stdout] 8  |  assert_eq!(s.next(), Some(Token::Operator("+".to_string(), ScanState::empty())));
[INFO] [stdout]    |             - cannot borrow as mutable
[INFO] [stdout] 9  |  assert_eq!(s.next(), Some(Token::Number(1, ScanState::empty())));
[INFO] [stdout]    |             - cannot borrow as mutable
[INFO] [stdout] 10 |  assert_eq!(s.next(), None);
[INFO] [stdout]    |             - cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 6  |  let mut s = Scanner::new("1 + 1");
[INFO] [stdout]    |      +++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/scanner.rs - scanner::Scanner<'a>::next (line 325)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 2 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.33s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6d3ed4e535f1d1c060e04fe6924b01f8ca69d99d04a47eb9eabc7f138169d762", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d3ed4e535f1d1c060e04fe6924b01f8ca69d99d04a47eb9eabc7f138169d762", kill_on_drop: false }`
[INFO] [stdout] 6d3ed4e535f1d1c060e04fe6924b01f8ca69d99d04a47eb9eabc7f138169d762
