[INFO] cloning repository https://github.com/UsQuake/fuzzingbook_rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/UsQuake/fuzzingbook_rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUsQuake%2Ffuzzingbook_rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUsQuake%2Ffuzzingbook_rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd856170138fec42ccd04ca2bb90abef06b52327
[INFO] checking UsQuake/fuzzingbook_rs/dd856170138fec42ccd04ca2bb90abef06b52327 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUsQuake%2Ffuzzingbook_rs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/UsQuake/fuzzingbook_rs on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/UsQuake/fuzzingbook_rs
[INFO] finished tweaking git repo https://github.com/UsQuake/fuzzingbook_rs
[INFO] tweaked toml for git repo https://github.com/UsQuake/fuzzingbook_rs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/UsQuake/fuzzingbook_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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ef6d9270b3d05d09c6fdee34762f911c08a6da63f167fd9e77ca36c33d6c95e5
[INFO] running `Command { std: "docker" "start" "-a" "ef6d9270b3d05d09c6fdee34762f911c08a6da63f167fd9e77ca36c33d6c95e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef6d9270b3d05d09c6fdee34762f911c08a6da63f167fd9e77ca36c33d6c95e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef6d9270b3d05d09c6fdee34762f911c08a6da63f167fd9e77ca36c33d6c95e5", kill_on_drop: false }`
[INFO] [stdout] ef6d9270b3d05d09c6fdee34762f911c08a6da63f167fd9e77ca36c33d6c95e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] daed06cdb6ac1fe490aaf9dd0677c0d5facf2529e866d28b28297c4ab316e211
[INFO] running `Command { std: "docker" "start" "-a" "daed06cdb6ac1fe490aaf9dd0677c0d5facf2529e866d28b28297c4ab316e211", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]     Checking either v1.11.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking fuzzingbook_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Instant`
[INFO] [stdout]   --> src/grammar/mod.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     time::{Instant, SystemTime, UNIX_EPOCH},
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Instant`
[INFO] [stdout]  --> src/grammar_fuzzer/mod.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 |     hash::{Hash, Hasher}, time::Instant,
[INFO] [stdout]   |                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `regex::*`
[INFO] [stdout]  --> src/grammar/test.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use regex::*;
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Instant`
[INFO] [stdout]   --> src/grammar/mod.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     time::{Instant, SystemTime, UNIX_EPOCH},
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Instant`
[INFO] [stdout]  --> src/grammar_fuzzer/mod.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 |     hash::{Hash, Hasher}, time::Instant,
[INFO] [stdout]   |                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `expansion` is never read
[INFO] [stdout]    --> src/grammar/mod.rs:188:25
[INFO] [stdout]     |
[INFO] [stdout] 188 |                         expansion = Union::OnlyA(sub_exp.clone());
[INFO] [stdout]     |                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `node`
[INFO] [stdout]    --> src/grammar_fuzzer/mod.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |         node: &DerivationTree,
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expansion`
[INFO] [stdout]    --> src/grammar_fuzzer/mod.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         expansion: &Expansion,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_expansion`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `expansion` is never read
[INFO] [stdout]    --> src/grammar/mod.rs:188:25
[INFO] [stdout]     |
[INFO] [stdout] 188 |                         expansion = Union::OnlyA(sub_exp.clone());
[INFO] [stdout]     |                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]    --> src/grammar_fuzzer/mod.rs:225:25
[INFO] [stdout]     |
[INFO] [stdout] 225 |                 let mut res = 0.0;
[INFO] [stdout]     |                         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trim_grammar` is never used
[INFO] [stdout]    --> src/grammar/mod.rs:405:4
[INFO] [stdout]     |
[INFO] [stdout] 405 | fn trim_grammar<'l_use>(grammar: &Grammar<'l_use>, start_symbol: &'l_use str) -> Grammar<'l_use> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `set_opts` is never used
[INFO] [stdout]   --> src/grammar/options.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn set_opts<'l_use>(
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Var` is never used
[INFO] [stdout]   --> src/grammar_fuzzer/var_ctx.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Var = (Ident, Trait);
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&dyn Any` instead of cloning the inner type
[INFO] [stdout]   --> src/grammar/options.rs:34:38
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Some(ref_ref) => Some(ref_ref.clone()),
[INFO] [stdout]    |                                      ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `node`
[INFO] [stdout]    --> src/grammar_fuzzer/mod.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |         node: &DerivationTree,
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expansion`
[INFO] [stdout]    --> src/grammar_fuzzer/mod.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         expansion: &Expansion,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_expansion`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]    --> src/grammar_fuzzer/mod.rs:225:25
[INFO] [stdout]     |
[INFO] [stdout] 225 |                 let mut res = 0.0;
[INFO] [stdout]     |                         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trim_grammar` is never used
[INFO] [stdout]    --> src/grammar/mod.rs:405:4
[INFO] [stdout]     |
[INFO] [stdout] 405 | fn trim_grammar<'l_use>(grammar: &Grammar<'l_use>, start_symbol: &'l_use str) -> Grammar<'l_use> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `set_opts` is never used
[INFO] [stdout]   --> src/grammar/options.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn set_opts<'l_use>(
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Var` is never used
[INFO] [stdout]   --> src/grammar_fuzzer/var_ctx.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Var = (Ident, Trait);
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&dyn Any` instead of cloning the inner type
[INFO] [stdout]   --> src/grammar/options.rs:34:38
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Some(ref_ref) => Some(ref_ref.clone()),
[INFO] [stdout]    |                                      ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `regex::Regex`
[INFO] [stdout]  --> src/bin/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use regex::Regex; 
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]  --> src/bin/main.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::time::{Duration, Instant};
[INFO] [stdout]   |                 ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `SystemTime`, `UNIX_EPOCH`, and `collections::*`
[INFO] [stdout]   --> src/bin/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout] 9  |     collections::*,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 10 |     time::{SystemTime, UNIX_EPOCH},
[INFO] [stdout]    |            ^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `regex::Regex`
[INFO] [stdout]  --> src/bin/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use regex::Regex; 
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]  --> src/bin/main.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::time::{Duration, Instant};
[INFO] [stdout]   |                 ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `SystemTime`, `UNIX_EPOCH`, and `collections::*`
[INFO] [stdout]   --> src/bin/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout] 9  |     collections::*,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 10 |     time::{SystemTime, UNIX_EPOCH},
[INFO] [stdout]    |            ^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.90s
[INFO] running `Command { std: "docker" "inspect" "daed06cdb6ac1fe490aaf9dd0677c0d5facf2529e866d28b28297c4ab316e211", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "daed06cdb6ac1fe490aaf9dd0677c0d5facf2529e866d28b28297c4ab316e211", kill_on_drop: false }`
[INFO] [stdout] daed06cdb6ac1fe490aaf9dd0677c0d5facf2529e866d28b28297c4ab316e211