[INFO] fetching crate pidgin 0.4.3...
[INFO] testing pidgin-0.4.3 against 1.55.0 for beta-1.56-1
[INFO] extracting crate pidgin 0.4.3 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate pidgin 0.4.3 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pidgin 0.4.3
[INFO] finished tweaking crates.io crate pidgin 0.4.3
[INFO] tweaked toml for crates.io crate pidgin 0.4.3 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_regex v1.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", 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] 5404aa9d11bd2f69d0447608bc7046afd890384e01320c632f094d6a102f141b
[INFO] running `Command { std: "docker" "start" "-a" "5404aa9d11bd2f69d0447608bc7046afd890384e01320c632f094d6a102f141b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5404aa9d11bd2f69d0447608bc7046afd890384e01320c632f094d6a102f141b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5404aa9d11bd2f69d0447608bc7046afd890384e01320c632f094d6a102f141b", kill_on_drop: false }`
[INFO] [stdout] 5404aa9d11bd2f69d0447608bc7046afd890384e01320c632f094d6a102f141b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a26e1bfd5209e0158a0957d3f6eb9e65d9f3bf5282027a32b27d0f5a090df538
[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" "a26e1bfd5209e0158a0957d3f6eb9e65d9f3bf5282027a32b27d0f5a090df538", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_regex v1.1.0
[INFO] [stderr]    Compiling pidgin v0.4.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/pidgin.rs:601:38
[INFO] [stdout]     |
[INFO] [stdout] 601 |     fn find_character_classes(&self, mut phrases: Vec<Vec<Expression>>) -> Vec<Vec<Expression>> {
[INFO] [stdout]     |                                      ----^^^^^^^
[INFO] [stdout]     |                                      |
[INFO] [stdout]     |                                      help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.56s
[INFO] running `Command { std: "docker" "inspect" "a26e1bfd5209e0158a0957d3f6eb9e65d9f3bf5282027a32b27d0f5a090df538", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a26e1bfd5209e0158a0957d3f6eb9e65d9f3bf5282027a32b27d0f5a090df538", kill_on_drop: false }`
[INFO] [stdout] a26e1bfd5209e0158a0957d3f6eb9e65d9f3bf5282027a32b27d0f5a090df538
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--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] e89b23ee7f0c0fd6168b067cb53cb9528c8a1099a8e72748cf585b1ba5f928b6
[INFO] running `Command { std: "docker" "start" "-a" "e89b23ee7f0c0fd6168b067cb53cb9528c8a1099a8e72748cf585b1ba5f928b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_cbor v0.11.2
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/pidgin.rs:601:38
[INFO] [stdout]     |
[INFO] [stdout] 601 |     fn find_character_classes(&self, mut phrases: Vec<Vec<Expression>>) -> Vec<Vec<Expression>> {
[INFO] [stdout]     |                                      ----^^^^^^^
[INFO] [stdout]     |                                      |
[INFO] [stdout]     |                                      help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling criterion v0.3.5
[INFO] [stderr]    Compiling pidgin v0.4.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/pidgin.rs:601:38
[INFO] [stdout]     |
[INFO] [stdout] 601 |     fn find_character_classes(&self, mut phrases: Vec<Vec<Expression>>) -> Vec<Vec<Expression>> {
[INFO] [stdout]     |                                      ----^^^^^^^
[INFO] [stdout]     |                                      |
[INFO] [stdout]     |                                      help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 19.21s
[INFO] running `Command { std: "docker" "inspect" "e89b23ee7f0c0fd6168b067cb53cb9528c8a1099a8e72748cf585b1ba5f928b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e89b23ee7f0c0fd6168b067cb53cb9528c8a1099a8e72748cf585b1ba5f928b6", kill_on_drop: false }`
[INFO] [stdout] e89b23ee7f0c0fd6168b067cb53cb9528c8a1099a8e72748cf585b1ba5f928b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", 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] f4f589c5d502bb18d34be38a2740a1bd8eeffb893f61cdba2baab2d6d0d4e7de
[INFO] running `Command { std: "docker" "start" "-a" "f4f589c5d502bb18d34be38a2740a1bd8eeffb893f61cdba2baab2d6d0d4e7de", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/pidgin.rs:601:38
[INFO] [stderr]     |
[INFO] [stderr] 601 |     fn find_character_classes(&self, mut phrases: Vec<Vec<Expression>>) -> Vec<Vec<Expression>> {
[INFO] [stderr]     |                                      ----^^^^^^^
[INFO] [stderr]     |                                      |
[INFO] [stderr]     |                                      help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `pidgin` (lib) generated 1 warning
[INFO] [stderr] warning: `pidgin` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/pidgin-d9475fcbfd176740)
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test util::tests::group_is_atomic ... ok
[INFO] [stdout] test util::tests::leading_slash_then_char_is_atomic ... ok
[INFO] [stdout] test util::tests::one_level_group_nesting ... ok
[INFO] [stdout] test util::tests::p_named_char_class_is_atomic ... ok
[INFO] [stdout] test util::tests::sequence_of_char_class_is_not_atomic ... ok
[INFO] [stderr]      Running tests/macro.rs (/opt/rustwide/target/debug/deps/macro-96bdb5216649d506)
[INFO] [stdout] test util::tests::one_level_char_class_nesting ... ok
[INFO] [stdout] test util::tests::simple_char_class_with_escape_is_atomic ... ok
[INFO] [stdout] test util::tests::simple_char_class_is_atomic ... ok
[INFO] [stdout] test util::tests::two_chars_where_first_is_not_slash_non_atomic ... ok
[INFO] [stdout] test util::tests::single_characters_are_atomic ... ok
[INFO] [stdout] test util::tests::char_and_p_named_char_class_is_not_atomic ... ok
[INFO] [stdout] test util::tests::sequence_of_groups_is_not_atomic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 51 tests
[INFO] [stdout] test children ... ok
[INFO] [stdout] test common_prefix ... ok
[INFO] [stdout] test foo_foo2 ... ok
[INFO] [stdout] test common_suffix ... ok
[INFO] [stdout] test complex_character_class ... ok
[INFO] [stdout] test complex_character_class_alternation ... ok
[INFO] [stdout] test foo_plus_bar ... ok
[INFO] [stdout] test long_character_class ... ok
[INFO] [stdout] test foo_star_bar ... ok
[INFO] [stdout] test has_test ... ok
[INFO] [stdout] test longer_repeat_found ... ok
[INFO] [stdout] test deep_name ... ok
[INFO] [stdout] test complex_repeat ... ok
[INFO] [stdout] test matcher_serialization ... ok
[INFO] [stdout] test foo_bar_foo ... ok
[INFO] [stdout] test foo_at_least_2_bar ... ok
[INFO] [stdout] test foo_bar ... ok
[INFO] [stdout] test multiple_definitions ... ok
[INFO] [stdout] test optional_space_with_repetition ... ok
[INFO] [stdout] test no_unicode ... ok
[INFO] [stdout] test foo_foo ... ok
[INFO] [stdout] test namespace_collision ... ok
[INFO] [stdout] test optional_space ... ok
[INFO] [stdout] test both_prefix_and_suffix ... ok
[INFO] [stdout] test foo_maybe_bar ... ok
[INFO] [stdout] test deep_all_names ... ok
[INFO] [stdout] test foo_at_2_to_4_bar ... ok
[INFO] [stdout] test regex_rule ... ok
[INFO] [stdout] test maybe_space ... ok
[INFO] [stdout] test rx ... ok
[INFO] [stdout] test rule_general_flags ... ok
[INFO] [stdout] test rule_general_and_specific_flags ... ok
[INFO] [stdout] test stinginess ... ok
[INFO] [stdout] test some_space ... ok
[INFO] [stdout] test parse_example ... ok
[INFO] [stdout] test rule_specific_flags ... ok
[INFO] [stdout] test vec_rule_with_repetition ... ok
[INFO] [stdout] test word_bound_left ... ok
[INFO] [stdout] test rule_example ... ok
[INFO] [stdout] test foreign_grammar ... ok
[INFO] [stdout] test small_repeat_ignored ... ok
[INFO] [stdout] test word_bound_right ... ok
[INFO] [stdout] test vec_rule_simple ... ok
[INFO] [stdout] test using_sub_rule ... ok
[INFO] [stdout] test short_character_class ... ok
[INFO] [stdout] test simple_alternation ... ok
[INFO] [stdout] test stingy ... ok
[INFO] [stdout] test rule_general_and_specific_b_flags ... ok
[INFO] [stdout] test complex_example ... ok
[INFO] [stdout] test messing_about ... ok
[INFO] [stdout] test rx_example ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 51 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.13s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests pidgin
[INFO] [stdout] 
[INFO] [stdout] running 39 tests
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name pidgin --test /opt/rustwide/workdir/src/lib.rs -L dependency=/opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern criterion=/opt/rustwide/target/debug/deps/libcriterion-f8e064c77e91f495.rlib --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-df981c5871754530.rlib --extern pidgin=/opt/rustwide/target/debug/deps/libpidgin-16360aa87e51f3d4.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-5ab5f6411868649c.rlib --extern regex=/opt/rustwide/target/debug/deps/libregex-27bd9e77ed307a48.rlib --extern serde=/opt/rustwide/target/debug/deps/libserde-1fd97383a9a4d8c3.rlib --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-6365c7faffae4aea.rlib --extern serde_regex=/opt/rustwide/target/debug/deps/libserde_regex-1917786530cc2432.rlib -C embed-bitcode=no --error-format human` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "f4f589c5d502bb18d34be38a2740a1bd8eeffb893f61cdba2baab2d6d0d4e7de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4f589c5d502bb18d34be38a2740a1bd8eeffb893f61cdba2baab2d6d0d4e7de", kill_on_drop: false }`
[INFO] [stdout] f4f589c5d502bb18d34be38a2740a1bd8eeffb893f61cdba2baab2d6d0d4e7de