[INFO] cloning repository https://github.com/m-bra/swirl
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/m-bra/swirl" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fm-bra%2Fswirl", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fm-bra%2Fswirl'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6ef1a00fd99f778f5f745b1d46f2b7a9b76fe8bc
[INFO] checking m-bra/swirl against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fm-bra%2Fswirl" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/m-bra/swirl on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/m-bra/swirl
[INFO] finished tweaking git repo https://github.com/m-bra/swirl
[INFO] tweaked toml for git repo https://github.com/m-bra/swirl written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded finally-block v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "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] 1a2d561add4abb2b379e7b64b90609005b5a7c5c24b42902481251c7e1043b4b
[INFO] running `Command { std: "docker" "start" "-a" "1a2d561add4abb2b379e7b64b90609005b5a7c5c24b42902481251c7e1043b4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a2d561add4abb2b379e7b64b90609005b5a7c5c24b42902481251c7e1043b4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a2d561add4abb2b379e7b64b90609005b5a7c5c24b42902481251c7e1043b4b", kill_on_drop: false }`
[INFO] [stdout] 1a2d561add4abb2b379e7b64b90609005b5a7c5c24b42902481251c7e1043b4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 03902b65ed19574ce1a323ee80f9a349b08d51e94ffb88b562ac604cd13e93d5
[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" "03902b65ed19574ce1a323ee80f9a349b08d51e94ffb88b562ac604cd13e93d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling libc v0.2.78
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling rayon-core v1.8.1
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling syn v1.0.42
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking half v1.6.0
[INFO] [stderr]     Checking oorandom v11.1.2
[INFO] [stderr]     Checking finally-block v0.2.0
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling rayon v1.4.1
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking criterion-plot v0.4.3
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking plotters v0.2.15
[INFO] [stderr]     Checking bstr v0.2.13
[INFO] [stderr]     Checking serde_json v1.0.58
[INFO] [stderr]     Checking serde_cbor v0.11.1
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]     Checking tinytemplate v1.1.0
[INFO] [stderr]     Checking criterion v0.3.3
[INFO] [stderr]     Checking swirl v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `level` is never read
[INFO] [stdout]    --> src/mmatch/match_invocation_string.rs:250:13
[INFO] [stdout]     |
[INFO] [stdout] 250 |             level -= 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `frame_result` is never read
[INFO] [stdout]    --> src/mmatch/match_rule_variant.rs:122:25
[INFO] [stdout]     |
[INFO] [stdout] 122 |                     let mut frame_result = Ok(("", InvocStrResult::empty())); // result of current frame
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `recursion_var`
[INFO] [stdout]   --> src/mmatch/match_rule_variant.rs:98:22
[INFO] [stdout]    |
[INFO] [stdout] 98 |                 let (recursion_var, recursive_param) = match unsafe { self.header().end_invocation().unwrap() } {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_recursion_var`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rule_name`
[INFO] [stdout]    --> src/types/rule_variant.rs:115:30
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn on_success(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_rule_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/types/rule_variant.rs:115:47
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn on_success(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rule_name`
[INFO] [stdout]    --> src/types/rule_variant.rs:127:30
[INFO] [stdout]     |
[INFO] [stdout] 127 |     pub fn on_failure(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_rule_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/types/rule_variant.rs:127:47
[INFO] [stdout]     |
[INFO] [stdout] 127 |     pub fn on_failure(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `level` is never read
[INFO] [stdout]    --> src/mmatch/match_invocation_string.rs:250:13
[INFO] [stdout]     |
[INFO] [stdout] 250 |             level -= 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `frame_result` is never read
[INFO] [stdout]    --> src/mmatch/match_rule_variant.rs:122:25
[INFO] [stdout]     |
[INFO] [stdout] 122 |                     let mut frame_result = Ok(("", InvocStrResult::empty())); // result of current frame
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `recursion_var`
[INFO] [stdout]   --> src/mmatch/match_rule_variant.rs:98:22
[INFO] [stdout]    |
[INFO] [stdout] 98 |                 let (recursion_var, recursive_param) = match unsafe { self.header().end_invocation().unwrap() } {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_recursion_var`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rule_name`
[INFO] [stdout]    --> src/types/rule_variant.rs:115:30
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn on_success(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_rule_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/types/rule_variant.rs:115:47
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn on_success(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rule_name`
[INFO] [stdout]    --> src/types/rule_variant.rs:127:30
[INFO] [stdout]     |
[INFO] [stdout] 127 |     pub fn on_failure(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_rule_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/types/rule_variant.rs:127:47
[INFO] [stdout]     |
[INFO] [stdout] 127 |     pub fn on_failure(&self, rule_name: &str, input: &str) {
[INFO] [stdout]     |                                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `first` should have an upper case name
[INFO] [stdout]  --> src/mmatch/match_rule_variant.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | static mut first: bool = true;
[INFO] [stdout]   |            ^^^^^ help: convert the identifier to upper case: `FIRST`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `first` should have an upper case name
[INFO] [stdout]  --> src/mmatch/match_rule_variant.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | static mut first: bool = true;
[INFO] [stdout]   |            ^^^^^ help: convert the identifier to upper case: `FIRST`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 00s
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "03902b65ed19574ce1a323ee80f9a349b08d51e94ffb88b562ac604cd13e93d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03902b65ed19574ce1a323ee80f9a349b08d51e94ffb88b562ac604cd13e93d5", kill_on_drop: false }`
[INFO] [stdout] 03902b65ed19574ce1a323ee80f9a349b08d51e94ffb88b562ac604cd13e93d5