[INFO] fetching crate antlr-rust 0.2.0...
[INFO] checking antlr-rust-0.2.0 against master#836c31742687ba4e2f857b5b698e1e9e6b67619c for pr-81789
[INFO] extracting crate antlr-rust 0.2.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate antlr-rust 0.2.0 on toolchain 836c31742687ba4e2f857b5b698e1e9e6b67619c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate antlr-rust 0.2.0
[INFO] finished tweaking crates.io crate antlr-rust 0.2.0
[INFO] tweaked toml for crates.io crate antlr-rust 0.2.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "fetch" "--locked" "--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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd243bf3c59d9b52696f2affd701d91c36a34dada192b8fca3611a5b4b1ffb45
[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" "bd243bf3c59d9b52696f2affd701d91c36a34dada192b8fca3611a5b4b1ffb45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd243bf3c59d9b52696f2affd701d91c36a34dada192b8fca3611a5b4b1ffb45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd243bf3c59d9b52696f2affd701d91c36a34dada192b8fca3611a5b4b1ffb45", kill_on_drop: false }`
[INFO] [stdout] bd243bf3c59d9b52696f2affd701d91c36a34dada192b8fca3611a5b4b1ffb45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b8745d7ff5effb57a19e86f07b7622f9ddc7e28c5b68ee16f8f5bd16d14f3b04
[INFO] running `Command { std: "docker" "start" "-a" "b8745d7ff5effb57a19e86f07b7622f9ddc7e28c5b68ee16f8f5bd16d14f3b04", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking typed-arena v2.0.1
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]    Compiling better_typeid_derive v0.1.1
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking lock_api v0.4.3
[INFO] [stderr]     Checking bit-set v0.5.2
[INFO] [stderr]     Checking murmur3 v0.4.1
[INFO] [stderr]     Checking better_any v0.1.1
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking antlr-rust v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `cached_hash`
[INFO] [stdout]   --> src/atn_config_set.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     cached_hash: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]    --> src/lexer.rs:78:1
[INFO] [stdout]     |
[INFO] [stdout] 78  | / pub struct BaseLexer<
[INFO] [stdout] 79  | |     'input,
[INFO] [stdout] 80  | |     T: LexerRecog<'input, Self> + 'static,
[INFO] [stdout] 81  | |     Input: CharStream<TF::From>,
[INFO] [stdout] ...   |
[INFO] [stdout] 109 | |     pub text: Option<<TF::Data as ToOwned>::Owned>,
[INFO] [stdout] 110 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:16:9
[INFO] [stdout]     |
[INFO] [stdout] 16  | #![warn(missing_debug_implementations)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]    --> src/parser.rs:107:1
[INFO] [stdout]     |
[INFO] [stdout] 107 | / pub struct BaseParser<
[INFO] [stdout] 108 | |     'input,
[INFO] [stdout] 109 | |     Ext: 'static, //: ParserRecog<'input, Self> + 'static, // user provided behavior, such as semantic predicates
[INFO] [stdout] 110 | |     I: TokenStream<'input>, // input stream
[INFO] [stdout] ...   |
[INFO] [stdout] 149 | |     pd: PhantomData<fn() -> &'input str>,
[INFO] [stdout] 150 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> tests/perf.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `performance`
[INFO] [stdout]   --> tests/perf.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn performance(_b: &mut Bencher) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `input`
[INFO] [stdout]   --> tests/perf.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | /     const input: &str = "\
[INFO] [stdout] 32 | |          between X1 and X2 or between X3 and X4 and
[INFO] [stdout] 33 | |          between X1 and X2 or between X3 and X4 and
[INFO] [stdout] 34 | |          between X1 and X2 or between X3 and X4 and
[INFO] [stdout] ...  |
[INFO] [stdout] 46 | |          between X1 and X2 or between X3 and X4
[INFO] [stdout] 47 | |          ;";
[INFO] [stdout]    | |____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `inner_deref` has been stable since 1.47.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> tests/perf.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(inner_deref)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]   --> tests/perf.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     #[ignore]
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `input` should have an upper case name
[INFO] [stdout]   --> tests/perf.rs:31:11
[INFO] [stdout]    |
[INFO] [stdout] 31 |     const input: &str = "\
[INFO] [stdout]    |           ^^^^^ help: convert the identifier to upper case: `INPUT`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> tests/my_test.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(specialization)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ParseTreeWalker`, `Tree`, `VisitChildren`
[INFO] [stdout]   --> tests/my_test.rs:23:57
[INFO] [stdout]    |
[INFO] [stdout] 23 |         ParseTree, ParseTreeListener, ParseTreeVisitor, ParseTreeWalker, TerminalNode, Tree,
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^^^^                ^^^^
[INFO] [stdout] 24 |         VisitChildren, Visitable,
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around `while` condition
[INFO] [stdout]    --> tests/gen/referencetoatnparser.rs:303:23
[INFO] [stdout]     |
[INFO] [stdout] 303 |                 while { _alt != 2 && _alt != INVALID_ALT } {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around `if` condition
[INFO] [stdout]    --> tests/gen/referencetoatnparser.rs:309:36
[INFO] [stdout]     |
[INFO] [stdout] 309 | ...                   if { !(_la == ID || _la == ATN) } {
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around `while` condition
[INFO] [stdout]    --> tests/gen/simplelrparser.rs:409:23
[INFO] [stdout]     |
[INFO] [stdout] 409 |                 while { _alt != 2 && _alt != INVALID_ALT } {
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around `while` condition
[INFO] [stdout]     --> tests/gen/labelsparser.rs:1036:23
[INFO] [stdout]      |
[INFO] [stdout] 1036 |                 while { _alt != 2 && _alt != INVALID_ALT } {
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `cached_hash`
[INFO] [stdout]   --> src/atn_config_set.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     cached_hash: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]    --> src/lexer.rs:78:1
[INFO] [stdout]     |
[INFO] [stdout] 78  | / pub struct BaseLexer<
[INFO] [stdout] 79  | |     'input,
[INFO] [stdout] 80  | |     T: LexerRecog<'input, Self> + 'static,
[INFO] [stdout] 81  | |     Input: CharStream<TF::From>,
[INFO] [stdout] ...   |
[INFO] [stdout] 109 | |     pub text: Option<<TF::Data as ToOwned>::Owned>,
[INFO] [stdout] 110 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:16:9
[INFO] [stdout]     |
[INFO] [stdout] 16  | #![warn(missing_debug_implementations)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]    --> src/parser.rs:107:1
[INFO] [stdout]     |
[INFO] [stdout] 107 | / pub struct BaseParser<
[INFO] [stdout] 108 | |     'input,
[INFO] [stdout] 109 | |     Ext: 'static, //: ParserRecog<'input, Self> + 'static, // user provided behavior, such as semantic predicates
[INFO] [stdout] 110 | |     I: TokenStream<'input>, // input stream
[INFO] [stdout] ...   |
[INFO] [stdout] 149 | |     pd: PhantomData<fn() -> &'input str>,
[INFO] [stdout] 150 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]   --> tests/my_test.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     use std::io::Read;
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `inner_deref` has been stable since 1.47.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> tests/my_test.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(inner_deref)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.93s
[INFO] running `Command { std: "docker" "inspect" "b8745d7ff5effb57a19e86f07b7622f9ddc7e28c5b68ee16f8f5bd16d14f3b04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8745d7ff5effb57a19e86f07b7622f9ddc7e28c5b68ee16f8f5bd16d14f3b04", kill_on_drop: false }`
[INFO] [stdout] b8745d7ff5effb57a19e86f07b7622f9ddc7e28c5b68ee16f8f5bd16d14f3b04