[INFO] fetching crate samply 0.12.0...
[INFO] checking samply-0.12.0 against master#eb10639928a2781cf0a12440007fbcc1e3a6888f for pr-127827-1
[INFO] extracting crate samply 0.12.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate samply 0.12.0 on toolchain eb10639928a2781cf0a12440007fbcc1e3a6888f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate samply 0.12.0
[INFO] finished tweaking crates.io crate samply 0.12.0
[INFO] tweaked toml for crates.io crate samply 0.12.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate samply 0.12.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b1fb284d5e3b23cfd1ab16e293be061a01d731bb95db344680d144af9b963c2
[INFO] running `Command { std: "docker" "start" "-a" "7b1fb284d5e3b23cfd1ab16e293be061a01d731bb95db344680d144af9b963c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b1fb284d5e3b23cfd1ab16e293be061a01d731bb95db344680d144af9b963c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b1fb284d5e3b23cfd1ab16e293be061a01d731bb95db344680d144af9b963c2", kill_on_drop: false }`
[INFO] [stdout] 7b1fb284d5e3b23cfd1ab16e293be061a01d731bb95db344680d144af9b963c2
[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b21141de5bf338cbc80a79160ffd8ef2b2fd15ae34ac35e399cb6392bbfa848f
[INFO] running `Command { std: "docker" "start" "-a" "b21141de5bf338cbc80a79160ffd8ef2b2fd15ae34ac35e399cb6392bbfa848f", kill_on_drop: false }`
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[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/shared/jit_category_manager.rs:14:16
[INFO] [stdout]    |
[INFO] [stdout] 14 |     SelfHosted(StringHandle),
[INFO] [stdout]    |     ---------- ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `JsName` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 14 |     SelfHosted(()),
[INFO] [stdout]    |                ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `main_thread_only` is never read
[INFO] [stdout]  --> src/shared/recording_props.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct RecordingProps {
[INFO] [stdout]   |            -------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     pub main_thread_only: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UnresolvedRssStatMarker` is never constructed
[INFO] [stdout]    --> src/shared/unresolved_samples.rs:197:12
[INFO] [stdout]     |
[INFO] [stdout] 197 | pub struct UnresolvedRssStatMarker {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UnresolvedRssStatMarker` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/shared/jit_category_manager.rs:14:16
[INFO] [stdout]    |
[INFO] [stdout] 14 |     SelfHosted(StringHandle),
[INFO] [stdout]    |     ---------- ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `JsName` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 14 |     SelfHosted(()),
[INFO] [stdout]    |                ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `main_thread_only` is never read
[INFO] [stdout]  --> src/shared/recording_props.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct RecordingProps {
[INFO] [stdout]   |            -------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     pub main_thread_only: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UnresolvedRssStatMarker` is never constructed
[INFO] [stdout]    --> src/shared/unresolved_samples.rs:197:12
[INFO] [stdout]     |
[INFO] [stdout] 197 | pub struct UnresolvedRssStatMarker {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UnresolvedRssStatMarker` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 57s
[INFO] running `Command { std: "docker" "inspect" "b21141de5bf338cbc80a79160ffd8ef2b2fd15ae34ac35e399cb6392bbfa848f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b21141de5bf338cbc80a79160ffd8ef2b2fd15ae34ac35e399cb6392bbfa848f", kill_on_drop: false }`
[INFO] [stdout] b21141de5bf338cbc80a79160ffd8ef2b2fd15ae34ac35e399cb6392bbfa848f