[INFO] cloning repository https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnicodeSnowman%2Fwriting_an_interpreter_in_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnicodeSnowman%2Fwriting_an_interpreter_in_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0952a8d5bbdba06124f3cc94e5528daa4a81c828
[INFO] checking UnicodeSnowman/writing_an_interpreter_in_rust against try#99a443d6903f71d521237d8acb5a3016b534d17b for pr-83354
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnicodeSnowman%2Fwriting_an_interpreter_in_rust" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust on toolchain 99a443d6903f71d521237d8acb5a3016b534d17b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99a443d6903f71d521237d8acb5a3016b534d17b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust
[INFO] finished tweaking git repo https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust
[INFO] tweaked toml for git repo https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/UnicodeSnowman/writing_an_interpreter_in_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99a443d6903f71d521237d8acb5a3016b534d17b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "rustops/crates-build-env@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+99a443d6903f71d521237d8acb5a3016b534d17b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dc6eba03a7cc1afd6250a5fbaa55d28680cf9e48773675fffccd2f2fa23c9e5d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "dc6eba03a7cc1afd6250a5fbaa55d28680cf9e48773675fffccd2f2fa23c9e5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc6eba03a7cc1afd6250a5fbaa55d28680cf9e48773675fffccd2f2fa23c9e5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc6eba03a7cc1afd6250a5fbaa55d28680cf9e48773675fffccd2f2fa23c9e5d", kill_on_drop: false }`
[INFO] [stdout] dc6eba03a7cc1afd6250a5fbaa55d28680cf9e48773675fffccd2f2fa23c9e5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+99a443d6903f71d521237d8acb5a3016b534d17b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] db7da4fa5a777fed8b50a03a104120a7cd6b612628f8e44bed4bdec22a0c66b4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "db7da4fa5a777fed8b50a03a104120a7cd6b612628f8e44bed4bdec22a0c66b4", kill_on_drop: false }`
[INFO] [stderr]     Checking writing_an_interpreter_in_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast.rs:16:29
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub statements: Vec<Box<Statement>>
[INFO] [stdout]    |                             ^^^^^^^^^ help: use `dyn`: `dyn Statement`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |     value: Box<Expression>
[INFO] [stdout]    |                ^^^^^^^^^^ help: use `dyn`: `dyn Expression`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast.rs:16:29
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub statements: Vec<Box<Statement>>
[INFO] [stdout]    |                             ^^^^^^^^^ help: use `dyn`: `dyn Statement`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |     value: Box<Expression>
[INFO] [stdout]    |                ^^^^^^^^^^ help: use `dyn`: `dyn Expression`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blah`
[INFO] [stdout]   --> src/parser.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let blah = lexer.current_token();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_blah`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blah`
[INFO] [stdout]   --> src/parser.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let blah = lexer.current_token();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_blah`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private trait `Statement` in public interface (error E0445)
[INFO] [stdout]   --> src/ast.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub statements: Vec<Box<Statement>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private trait `Statement` in public interface (error E0445)
[INFO] [stdout]   --> src/ast.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub statements: Vec<Box<Statement>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `token_literal`
[INFO] [stdout]   --> src/ast.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn token_literal(&self) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/ast.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     name: Identifier<'a>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ast.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     value: Box<Expression>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ast.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     value: &'a str
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `lexer`
[INFO] [stdout]  --> src/parser.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     lexer: &'p mut Lexer,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `errors`
[INFO] [stdout]  --> src/parser.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     errors: Vec<&'p str>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `current_token`
[INFO] [stdout]  --> src/parser.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     current_token: Token<'p>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `peek_token`
[INFO] [stdout]  --> src/parser.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     peek_token: Token<'p>
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `next_token`
[INFO] [stdout]   --> src/parser.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn next_token(&'p mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `token_literal`
[INFO] [stdout]   --> src/ast.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn token_literal(&self) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/ast.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     name: Identifier<'a>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ast.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     value: Box<Expression>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ast.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     value: &'a str
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `lexer`
[INFO] [stdout]  --> src/parser.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     lexer: &'p mut Lexer,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `errors`
[INFO] [stdout]  --> src/parser.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     errors: Vec<&'p str>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `current_token`
[INFO] [stdout]  --> src/parser.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     current_token: Token<'p>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `peek_token`
[INFO] [stdout]  --> src/parser.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     peek_token: Token<'p>
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `next_token`
[INFO] [stdout]   --> src/parser.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn next_token(&'p mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.74s
[INFO] running `Command { std: "docker" "inspect" "db7da4fa5a777fed8b50a03a104120a7cd6b612628f8e44bed4bdec22a0c66b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db7da4fa5a777fed8b50a03a104120a7cd6b612628f8e44bed4bdec22a0c66b4", kill_on_drop: false }`
[INFO] [stdout] db7da4fa5a777fed8b50a03a104120a7cd6b612628f8e44bed4bdec22a0c66b4