[INFO] cloning repository https://github.com/shika-blyat/regex-engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shika-blyat/regex-engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshika-blyat%2Fregex-engine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshika-blyat%2Fregex-engine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 073551372d25adffb72b138cb5b7a3428e653198
[INFO] checking shika-blyat/regex-engine against try#7dabc88a3b6768751847baeb49983f31ac5f20e2 for pr-155945
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshika-blyat%2Fregex-engine" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shika-blyat/regex-engine
[INFO] finished tweaking git repo https://github.com/shika-blyat/regex-engine
[INFO] tweaked toml for git repo https://github.com/shika-blyat/regex-engine written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shika-blyat/regex-engine on toolchain 7dabc88a3b6768751847baeb49983f31ac5f20e2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/shika-blyat/regex-engine 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" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2be707be28fda14a59911d61a259c63707b2c726f9a0062339295a8f2df719b8
[INFO] running `Command { std: "docker" "start" "-a" "2be707be28fda14a59911d61a259c63707b2c726f9a0062339295a8f2df719b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2be707be28fda14a59911d61a259c63707b2c726f9a0062339295a8f2df719b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2be707be28fda14a59911d61a259c63707b2c726f9a0062339295a8f2df719b8", kill_on_drop: false }`
[INFO] [stdout] 2be707be28fda14a59911d61a259c63707b2c726f9a0062339295a8f2df719b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+7dabc88a3b6768751847baeb49983f31ac5f20e2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 500292a0f14f6036573c7ead60173be0cfb146c3bfb1df0b4f25d36c41c0d75b
[INFO] running `Command { std: "docker" "start" "-a" "500292a0f14f6036573c7ead60173be0cfb146c3bfb1df0b4f25d36c41c0d75b", kill_on_drop: false }`
[INFO] [stderr]     Checking math-eval-tuto v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `NFA`
[INFO] [stdout]  --> src/main.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nfa::{NFABuilder, NFA};
[INFO] [stdout]   |                       ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `NFA`
[INFO] [stdout]  --> src/main.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nfa::{NFABuilder, NFA};
[INFO] [stdout]   |                       ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:141:13
[INFO] [stdout]     |
[INFO] [stdout] 141 |         let mut final_states = HashSet::new();
[INFO] [stdout]     |             ----^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:141:13
[INFO] [stdout]     |
[INFO] [stdout] 141 |         let mut final_states = HashSet::new();
[INFO] [stdout]     |             ----^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:142:13
[INFO] [stdout]     |
[INFO] [stdout] 142 |         let mut function = |handle: NodeHandle| {};
[INFO] [stdout]     |             ----^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:142:13
[INFO] [stdout]     |
[INFO] [stdout] 142 |         let mut function = |handle: NodeHandle| {};
[INFO] [stdout]     |             ----^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle`
[INFO] [stdout]    --> src/nfa.rs:142:29
[INFO] [stdout]     |
[INFO] [stdout] 142 |         let mut function = |handle: NodeHandle| {};
[INFO] [stdout]     |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle`
[INFO] [stdout]    --> src/nfa.rs:142:29
[INFO] [stdout]     |
[INFO] [stdout] 142 |         let mut function = |handle: NodeHandle| {};
[INFO] [stdout]     |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_all_final_states_internal` is never used
[INFO] [stdout]    --> src/nfa.rs:146:8
[INFO] [stdout]     |
[INFO] [stdout]  69 | impl NFABuilder {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 146 |     fn get_all_final_states_internal(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_all_final_states_internal` is never used
[INFO] [stdout]    --> src/nfa.rs:146:8
[INFO] [stdout]     |
[INFO] [stdout]  69 | impl NFABuilder {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 146 |     fn get_all_final_states_internal(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/nfa.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 | /             write!(
[INFO] [stdout] 19 | |                 fmtr,
[INFO] [stdout] 20 | |                 "{} -'{}'> {}\n",
[INFO] [stdout] 21 | |                 self.starting_node,
[INFO] [stdout] 22 | |                 trans.consumes.unwrap_or('\0'),
[INFO] [stdout] 23 | |                 trans.to
[INFO] [stdout] 24 | |             );
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |             let _ = write!(
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/nfa.rs:29:21
[INFO] [stdout]    |
[INFO] [stdout] 29 | /                     write!(
[INFO] [stdout] 30 | |                         fmtr,
[INFO] [stdout] 31 | |                         "{} -'{}'> {}\n",
[INFO] [stdout] 32 | |                         idx,
[INFO] [stdout] 33 | |                         trans.consumes.unwrap_or('\0'),
[INFO] [stdout] 34 | |                         trans.to,
[INFO] [stdout] 35 | |                     );
[INFO] [stdout]    | |_____________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 29 |                     let _ = write!(
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/nfa.rs:38:21
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     write!(fmtr, "{} ->\n", idx);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     let _ = write!(fmtr, "{} ->\n", idx);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/nfa.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 | /             write!(
[INFO] [stdout] 19 | |                 fmtr,
[INFO] [stdout] 20 | |                 "{} -'{}'> {}\n",
[INFO] [stdout] 21 | |                 self.starting_node,
[INFO] [stdout] 22 | |                 trans.consumes.unwrap_or('\0'),
[INFO] [stdout] 23 | |                 trans.to
[INFO] [stdout] 24 | |             );
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |             let _ = write!(
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/nfa.rs:29:21
[INFO] [stdout]    |
[INFO] [stdout] 29 | /                     write!(
[INFO] [stdout] 30 | |                         fmtr,
[INFO] [stdout] 31 | |                         "{} -'{}'> {}\n",
[INFO] [stdout] 32 | |                         idx,
[INFO] [stdout] 33 | |                         trans.consumes.unwrap_or('\0'),
[INFO] [stdout] 34 | |                         trans.to,
[INFO] [stdout] 35 | |                     );
[INFO] [stdout]    | |_____________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 29 |                     let _ = write!(
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/nfa.rs:38:21
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     write!(fmtr, "{} ->\n", idx);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     let _ = write!(fmtr, "{} ->\n", idx);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "500292a0f14f6036573c7ead60173be0cfb146c3bfb1df0b4f25d36c41c0d75b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "500292a0f14f6036573c7ead60173be0cfb146c3bfb1df0b4f25d36c41c0d75b", kill_on_drop: false }`
[INFO] [stdout] 500292a0f14f6036573c7ead60173be0cfb146c3bfb1df0b4f25d36c41c0d75b
