[INFO] fetching crate kaon 0.1.4...
[INFO] checking kaon-0.1.4 against master#507271bc119683008ec719ecee48814e8ac86c65 for pr-146440
[INFO] extracting crate kaon 0.1.4 into /workspace/builds/worker-4-tc1/source
[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-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate kaon 0.1.4 on toolchain 507271bc119683008ec719ecee48814e8ac86c65
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+507271bc119683008ec719ecee48814e8ac86c65" "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" "+507271bc119683008ec719ecee48814e8ac86c65" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 75 packages to latest compatible versions
[INFO] [stderr]       Adding ahash v0.7.8 (available: v0.8.12)
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.8.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+507271bc119683008ec719ecee48814e8ac86c65" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+507271bc119683008ec719ecee48814e8ac86c65" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d216ec535d375f6a516e73f941345f16177af691721d81bde13cae73e1041e79
[INFO] running `Command { std: "docker" "start" "-a" "d216ec535d375f6a516e73f941345f16177af691721d81bde13cae73e1041e79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d216ec535d375f6a516e73f941345f16177af691721d81bde13cae73e1041e79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d216ec535d375f6a516e73f941345f16177af691721d81bde13cae73e1041e79", kill_on_drop: false }`
[INFO] [stdout] d216ec535d375f6a516e73f941345f16177af691721d81bde13cae73e1041e79
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+507271bc119683008ec719ecee48814e8ac86c65" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6616677e888150340350395edfc78cb688576a79ba655428f6d09a67fb66959f
[INFO] running `Command { std: "docker" "start" "-a" "6616677e888150340350395edfc78cb688576a79ba655428f6d09a67fb66959f", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]    Compiling libc v0.2.186
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling zmij v1.0.21
[INFO] [stderr]    Compiling unicode-ident v1.0.24
[INFO] [stderr]    Compiling autocfg v1.5.1
[INFO] [stderr]    Compiling serde_json v1.0.150
[INFO] [stderr]     Checking either v1.16.0
[INFO] [stderr]     Checking itoa v1.0.18
[INFO] [stderr]    Compiling ahash v0.7.8
[INFO] [stderr]     Checking regex-syntax v0.8.10
[INFO] [stderr]     Checking unicode-width v0.1.14
[INFO] [stderr]     Checking ryu v1.0.23
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking once_cell v1.21.4
[INFO] [stderr]     Checking smallvec v1.15.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking rayon v1.12.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking aho-corasick v1.1.4
[INFO] [stderr]     Checking csv-core v0.1.13
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking plotters v0.3.7
[INFO] [stderr]     Checking getrandom v0.2.17
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking criterion-plot v0.4.5
[INFO] [stderr]     Checking kaon v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]     Checking csv v1.4.0
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/compiler/ast.rs:57:22
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub struct StmtBlock(SmallVec<[Stmt; 4]>, Span);
[INFO] [stdout]    |            --------- ^^^^^^^^^^^^^^^^^^^  ^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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]     |                                                        ^^^^^^^^^
[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: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 311 -                     self.stack.push(data.value.as_ref().borrow().clone());
[INFO] [stdout] 311 +                     self.stack.push(data.value.as_ref().clone());
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Value`, implement `Clone` for it
[INFO] [stdout]    --> src/common/value.rs:19:1
[INFO] [stdout]     |
[INFO] [stdout]  19 + #[derive(Clone)]
[INFO] [stdout]  20 | pub enum Value {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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]     |                                                    ^^^^^^^^^
[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] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 585 -             upvalue.closed = upvalue.value.as_ref().borrow().clone();
[INFO] [stdout] 585 +             upvalue.closed = upvalue.value.as_ref().clone();
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Value`, implement `Clone` for it
[INFO] [stdout]    --> src/common/value.rs:19:1
[INFO] [stdout]     |
[INFO] [stdout]  19 + #[derive(Clone)]
[INFO] [stdout]  20 | pub enum Value {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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]     |                                                                          ^^^^^^^^^
[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] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 588 -             self.open_upvalues = upvalue.next.as_ref().map(|v| v.as_ref().borrow().clone());
[INFO] [stdout] 588 +             self.open_upvalues = upvalue.next.as_ref().map(|v| v.as_ref().clone());
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Upvalue`, implement `Clone` for it
[INFO] [stdout]    --> src/common/value.rs:832:1
[INFO] [stdout]     |
[INFO] [stdout] 832 + #[derive(Clone)]
[INFO] [stdout] 833 | pub struct Upvalue {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking regex v1.12.3
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stdout] warning: struct `MockError` is never constructed
[INFO] [stdout]  --> tests/test_error.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct MockError;
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/compiler/ast.rs:57:22
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub struct StmtBlock(SmallVec<[Stmt; 4]>, Span);
[INFO] [stdout]    |            --------- ^^^^^^^^^^^^^^^^^^^  ^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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]     |                                                        ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `value::Value` does not implement `Borrow`, so calling `borrow` on `&value::Value` 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] 311 -                     self.stack.push(data.value.as_ref().borrow().clone());
[INFO] [stdout] 311 +                     self.stack.push(data.value.as_ref().clone());
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `value::Value`, implement `Clone` for it
[INFO] [stdout]    --> src/common/value.rs:19:1
[INFO] [stdout]     |
[INFO] [stdout]  19 + #[derive(Clone)]
[INFO] [stdout]  20 | pub enum Value {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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]     |                                                    ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `value::Value` does not implement `Borrow`, so calling `borrow` on `&value::Value` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 585 -             upvalue.closed = upvalue.value.as_ref().borrow().clone();
[INFO] [stdout] 585 +             upvalue.closed = upvalue.value.as_ref().clone();
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `value::Value`, implement `Clone` for it
[INFO] [stdout]    --> src/common/value.rs:19:1
[INFO] [stdout]     |
[INFO] [stdout]  19 + #[derive(Clone)]
[INFO] [stdout]  20 | pub enum Value {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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]     |                                                                          ^^^^^^^^^
[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] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 588 -             self.open_upvalues = upvalue.next.as_ref().map(|v| v.as_ref().borrow().clone());
[INFO] [stdout] 588 +             self.open_upvalues = upvalue.next.as_ref().map(|v| v.as_ref().clone());
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Upvalue`, implement `Clone` for it
[INFO] [stdout]    --> src/common/value.rs:832:1
[INFO] [stdout]     |
[INFO] [stdout] 832 + #[derive(Clone)]
[INFO] [stdout] 833 | pub struct Upvalue {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.23s
[INFO] running `Command { std: "docker" "inspect" "6616677e888150340350395edfc78cb688576a79ba655428f6d09a67fb66959f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6616677e888150340350395edfc78cb688576a79ba655428f6d09a67fb66959f", kill_on_drop: false }`
[INFO] [stdout] 6616677e888150340350395edfc78cb688576a79ba655428f6d09a67fb66959f
