[INFO] fetching crate kaon 0.1.4...
[INFO] checking kaon-0.1.4 against try#024378d9203a4009ed73d6db2681b88a8d74ce7a for pr-112160
[INFO] extracting crate kaon 0.1.4 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate kaon 0.1.4 on toolchain 024378d9203a4009ed73d6db2681b88a8d74ce7a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate kaon 0.1.4
[INFO] finished tweaking crates.io crate kaon 0.1.4
[INFO] tweaked toml for crates.io crate kaon 0.1.4 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 85151c673ac5085ec319000614ec956b39cc9afd39312139939fa82419211fb9
[INFO] running `Command { std: "docker" "start" "-a" "85151c673ac5085ec319000614ec956b39cc9afd39312139939fa82419211fb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "85151c673ac5085ec319000614ec956b39cc9afd39312139939fa82419211fb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85151c673ac5085ec319000614ec956b39cc9afd39312139939fa82419211fb9", kill_on_drop: false }`
[INFO] [stdout] 85151c673ac5085ec319000614ec956b39cc9afd39312139939fa82419211fb9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c8573893ddd85f5bc38a927d06231a132c9e3e74fa5cb9b1112d16c23fa52192
[INFO] running `Command { std: "docker" "start" "-a" "c8573893ddd85f5bc38a927d06231a132c9e3e74fa5cb9b1112d16c23fa52192", kill_on_drop: false }`
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking plotters-backend v0.3.4
[INFO] [stderr]     Checking rayon-core v1.11.0
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking cast v0.3.0
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking plotters-svg v0.3.3
[INFO] [stderr]     Checking once_cell v1.18.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking plotters v0.3.4
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking rayon v1.7.0
[INFO] [stderr]     Checking csv v1.2.2
[INFO] [stderr]     Checking walkdir v2.3.3
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]     Checking termcolor v1.2.0
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking kaon v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex v1.8.3
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] warning: using `.borrow()` on a double reference, which returns `value::Class` instead of borrowing the inner type
[INFO] [stdout]    --> src/common/value.rs:530:37
[INFO] [stdout]     |
[INFO] [stdout] 530 |         let methods = class.as_ref().borrow().methods.borrow();
[INFO] [stdout]     |                                     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.borrow()` on a double reference, which returns `&Upvalue` instead of borrowing the inner type
[INFO] [stdout]    --> src/runtime/vm.rs:306:98
[INFO] [stdout]     |
[INFO] [stdout] 306 |                       let data = self.frames[self.frame_count - 1].closure.captures.borrow()[index]
[INFO] [stdout]     |  __________________________________________________________________________________________________^
[INFO] [stdout] 307 | |                         .borrow()
[INFO] [stdout]     | |_________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/runtime/vm.rs:311:56
[INFO] [stdout]     |
[INFO] [stdout] 311 |                     self.stack.push(data.value.as_ref().borrow().clone());
[INFO] [stdout]     |                                                        ^^^^^^^^^ unnecessary method call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Value` does not implement `Borrow`, so calling `borrow` on `&Value` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[deny(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/runtime/vm.rs:585:52
[INFO] [stdout]     |
[INFO] [stdout] 585 |             upvalue.closed = upvalue.value.as_ref().borrow().clone();
[INFO] [stdout]     |                                                    ^^^^^^^^^ unnecessary method call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Value` does not implement `Borrow`, so calling `borrow` on `&Value` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/runtime/vm.rs:588:74
[INFO] [stdout]     |
[INFO] [stdout] 588 |             self.open_upvalues = upvalue.next.as_ref().map(|v| v.as_ref().borrow().clone());
[INFO] [stdout]     |                                                                          ^^^^^^^^^ unnecessary method call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Upvalue` does not implement `Borrow`, so calling `borrow` on `&Upvalue` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kaon` (lib) due to 4 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "c8573893ddd85f5bc38a927d06231a132c9e3e74fa5cb9b1112d16c23fa52192", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8573893ddd85f5bc38a927d06231a132c9e3e74fa5cb9b1112d16c23fa52192", kill_on_drop: false }`
[INFO] [stdout] c8573893ddd85f5bc38a927d06231a132c9e3e74fa5cb9b1112d16c23fa52192