[INFO] fetching crate artlr_syntax 0.3.0...
[INFO] checking artlr_syntax-0.3.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate artlr_syntax 0.3.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate artlr_syntax 0.3.0
[INFO] finished tweaking crates.io crate artlr_syntax 0.3.0
[INFO] tweaked toml for crates.io crate artlr_syntax 0.3.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate artlr_syntax 0.3.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d578998aef665515c9aceeffc67199cecd83ea5ce7e44a43f488f603fe81f3a7
[INFO] running `Command { std: "docker" "start" "-a" "d578998aef665515c9aceeffc67199cecd83ea5ce7e44a43f488f603fe81f3a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d578998aef665515c9aceeffc67199cecd83ea5ce7e44a43f488f603fe81f3a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d578998aef665515c9aceeffc67199cecd83ea5ce7e44a43f488f603fe81f3a7", kill_on_drop: false }`
[INFO] [stdout] d578998aef665515c9aceeffc67199cecd83ea5ce7e44a43f488f603fe81f3a7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e172f05c1030b9c8686e6411fc3e4994cb065a64a4cd7be01ad4c24f9595ad6
[INFO] running `Command { std: "docker" "start" "-a" "2e172f05c1030b9c8686e6411fc3e4994cb065a64a4cd7be01ad4c24f9595ad6", kill_on_drop: false }`
[INFO] [stderr]     Checking artlr_syntax v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/grammar/first_follow_symbols.rs:296:45
[INFO] [stdout]     |
[INFO] [stdout] 296 |                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout]     |                                             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `HashSet<T>` does not implement `Borrow`, so calling `borrow` on `&HashSet<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 296 -                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout] 296 +                 .get(output_symbol).unwrap();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/parser/recursive_descent_parser.rs:248:9
[INFO] [stdout]     |
[INFO] [stdout] 248 |         &self,
[INFO] [stdout]     |         ^^^^^ this lifetime flows to the output
[INFO] [stdout] ...
[INFO] [stdout] 252 |     ) -> ParseSymbolResult<TLex, TSyntax> {
[INFO] [stdout]     |          -------------------------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 252 |     ) -> ParseSymbolResult<'_, TLex, TSyntax> {
[INFO] [stdout]     |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/parser/recursive_descent_parser.rs:325:9
[INFO] [stdout]     |
[INFO] [stdout] 325 |         &self,
[INFO] [stdout]     |         ^^^^^ this lifetime flows to the output
[INFO] [stdout] ...
[INFO] [stdout] 329 |     ) -> ParseSymbolResult<TLex, TSyntax> {
[INFO] [stdout]     |          -------------------------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 329 |     ) -> ParseSymbolResult<'_, TLex, TSyntax> {
[INFO] [stdout]     |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/grammar/first_follow_symbols.rs:296:45
[INFO] [stdout]     |
[INFO] [stdout] 296 |                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout]     |                                             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `HashSet<T>` does not implement `Borrow`, so calling `borrow` on `&HashSet<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 296 -                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout] 296 +                 .get(output_symbol).unwrap();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/parser/recursive_descent_parser.rs:248:9
[INFO] [stdout]     |
[INFO] [stdout] 248 |         &self,
[INFO] [stdout]     |         ^^^^^ this lifetime flows to the output
[INFO] [stdout] ...
[INFO] [stdout] 252 |     ) -> ParseSymbolResult<TLex, TSyntax> {
[INFO] [stdout]     |          -------------------------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 252 |     ) -> ParseSymbolResult<'_, TLex, TSyntax> {
[INFO] [stdout]     |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/parser/recursive_descent_parser.rs:325:9
[INFO] [stdout]     |
[INFO] [stdout] 325 |         &self,
[INFO] [stdout]     |         ^^^^^ this lifetime flows to the output
[INFO] [stdout] ...
[INFO] [stdout] 329 |     ) -> ParseSymbolResult<TLex, TSyntax> {
[INFO] [stdout]     |          -------------------------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 329 |     ) -> ParseSymbolResult<'_, TLex, TSyntax> {
[INFO] [stdout]     |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `Command { std: "docker" "inspect" "2e172f05c1030b9c8686e6411fc3e4994cb065a64a4cd7be01ad4c24f9595ad6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e172f05c1030b9c8686e6411fc3e4994cb065a64a4cd7be01ad4c24f9595ad6", kill_on_drop: false }`
[INFO] [stdout] 2e172f05c1030b9c8686e6411fc3e4994cb065a64a4cd7be01ad4c24f9595ad6