[INFO] cloning repository https://github.com/bigyihsuan/rusty_deque
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bigyihsuan/rusty_deque" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbigyihsuan%2Frusty_deque", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbigyihsuan%2Frusty_deque'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ff79f16b506ef80596539c7045225606568dd998
[INFO] checking bigyihsuan/rusty_deque against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbigyihsuan%2Frusty_deque" "/workspace/builds/worker-89/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-89/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bigyihsuan/rusty_deque on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bigyihsuan/rusty_deque
[INFO] finished tweaking git repo https://github.com/bigyihsuan/rusty_deque
[INFO] tweaked toml for git repo https://github.com/bigyihsuan/rusty_deque written to /workspace/builds/worker-89/source/Cargo.toml
[INFO] crate git repo https://github.com/bigyihsuan/rusty_deque already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 82e5b42bbada37d16730b2bf717d2947290c3e8fd86f59c00f50e05e1c72b964
[INFO] running `Command { std: "docker" "start" "-a" "82e5b42bbada37d16730b2bf717d2947290c3e8fd86f59c00f50e05e1c72b964", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "82e5b42bbada37d16730b2bf717d2947290c3e8fd86f59c00f50e05e1c72b964", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82e5b42bbada37d16730b2bf717d2947290c3e8fd86f59c00f50e05e1c72b964", kill_on_drop: false }`
[INFO] [stdout] 82e5b42bbada37d16730b2bf717d2947290c3e8fd86f59c00f50e05e1c72b964
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8165597fcd6b377cfbdd9d2a33673f670dddb55e3099917bad0a52a98c21bf1b
[INFO] running `Command { std: "docker" "start" "-a" "8165597fcd6b377cfbdd9d2a33673f670dddb55e3099917bad0a52a98c21bf1b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rusty_deque v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `code`
[INFO] [stdout]  --> src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let code = "{ alpha! { beta! }~ delta! }!";
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_code`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/evaluator.rs:154:41
[INFO] [stdout]     |
[INFO] [stdout] 154 |         fn visit_instruction(&mut self, i: Instruction) -> StackElement {
[INFO] [stdout]     |                                         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/evaluator.rs:162:35
[INFO] [stdout]     |
[INFO] [stdout] 162 |         fn visit_block(&mut self, b: Block) -> StackElement {
[INFO] [stdout]     |                                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/evaluator.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |         pub fn new() -> TreePrinter {
[INFO] [stdout]    |                ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser.rs:258:13
[INFO] [stdout]     |
[INFO] [stdout] 258 |             &mut self.advance(); // skip list start
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 258 |             let _ = &mut self.advance(); // skip list start
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser.rs:277:17
[INFO] [stdout]     |
[INFO] [stdout] 277 |                 &mut self.advance();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 277 |                 let _ = &mut self.advance();
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser.rs:309:21
[INFO] [stdout]     |
[INFO] [stdout] 309 |                     &self.advance();
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 309 |                     let _ = &self.advance();
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `code`
[INFO] [stdout]  --> src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let code = "{ alpha! { beta! }~ delta! }!";
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_code`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/evaluator.rs:154:41
[INFO] [stdout]     |
[INFO] [stdout] 154 |         fn visit_instruction(&mut self, i: Instruction) -> StackElement {
[INFO] [stdout]     |                                         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/evaluator.rs:162:35
[INFO] [stdout]     |
[INFO] [stdout] 162 |         fn visit_block(&mut self, b: Block) -> StackElement {
[INFO] [stdout]     |                                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/evaluator.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |         pub fn new() -> TreePrinter {
[INFO] [stdout]    |                ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser.rs:258:13
[INFO] [stdout]     |
[INFO] [stdout] 258 |             &mut self.advance(); // skip list start
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 258 |             let _ = &mut self.advance(); // skip list start
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser.rs:277:17
[INFO] [stdout]     |
[INFO] [stdout] 277 |                 &mut self.advance();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 277 |                 let _ = &mut self.advance();
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser.rs:309:21
[INFO] [stdout]     |
[INFO] [stdout] 309 |                     &self.advance();
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 309 |                     let _ = &self.advance();
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.75s
[INFO] running `Command { std: "docker" "inspect" "8165597fcd6b377cfbdd9d2a33673f670dddb55e3099917bad0a52a98c21bf1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8165597fcd6b377cfbdd9d2a33673f670dddb55e3099917bad0a52a98c21bf1b", kill_on_drop: false }`
[INFO] [stdout] 8165597fcd6b377cfbdd9d2a33673f670dddb55e3099917bad0a52a98c21bf1b