[INFO] fetching crate core_extensions_proc_macros 1.4.0...
[INFO] checking core_extensions_proc_macros-1.4.0 against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate core_extensions_proc_macros 1.4.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate core_extensions_proc_macros 1.4.0 on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate core_extensions_proc_macros 1.4.0
[INFO] finished tweaking crates.io crate core_extensions_proc_macros 1.4.0
[INFO] tweaked toml for crates.io crate core_extensions_proc_macros 1.4.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] de8a113ed28d5c7cf639ae7eb2a2180d37519d617d7ab82c393fe2f6905e9e1d
[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" "de8a113ed28d5c7cf639ae7eb2a2180d37519d617d7ab82c393fe2f6905e9e1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de8a113ed28d5c7cf639ae7eb2a2180d37519d617d7ab82c393fe2f6905e9e1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de8a113ed28d5c7cf639ae7eb2a2180d37519d617d7ab82c393fe2f6905e9e1d", kill_on_drop: false }`
[INFO] [stdout] de8a113ed28d5c7cf639ae7eb2a2180d37519d617d7ab82c393fe2f6905e9e1d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--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] 7d901dc148d2aa36bceefa5850c97588e2f30111ffabae016b32603002586514
[INFO] running `Command { std: "docker" "start" "-a" "7d901dc148d2aa36bceefa5850c97588e2f30111ffabae016b32603002586514", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-xid v0.2.2
[INFO] [stderr]     Checking core_extensions_proc_macros v1.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]    --> src/lib.rs:188:1
[INFO] [stdout]     |
[INFO] [stdout] 188 | / macro_rules! try_ {
[INFO] [stdout] 189 | |     ( $expr:expr )=>{
[INFO] [stdout] 190 | |         match $expr {
[INFO] [stdout] 191 | |             Ok(x) => x,
[INFO] [stdout] ...   |
[INFO] [stdout] 200 | |     };
[INFO] [stdout] 201 | | } use try_;
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `try_`
[INFO] [stdout]    --> src/lib.rs:201:7
[INFO] [stdout]     |
[INFO] [stdout] 201 | } use try_;
[INFO] [stdout]     |       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking proc-macro2 v1.0.27
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `String`, `ToString`
[INFO] [stdout]  --> src/tests.rs:6:21
[INFO] [stdout]   |
[INFO] [stdout] 6 | use alloc::string::{String, ToString};
[INFO] [stdout]   |                     ^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]    --> src/lib.rs:188:1
[INFO] [stdout]     |
[INFO] [stdout] 188 | / macro_rules! try_ {
[INFO] [stdout] 189 | |     ( $expr:expr )=>{
[INFO] [stdout] 190 | |         match $expr {
[INFO] [stdout] 191 | |             Ok(x) => x,
[INFO] [stdout] ...   |
[INFO] [stdout] 200 | |     };
[INFO] [stdout] 201 | | } use try_;
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `try_`
[INFO] [stdout]    --> src/lib.rs:201:7
[INFO] [stdout]     |
[INFO] [stdout] 201 | } use try_;
[INFO] [stdout]     |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.49s
[INFO] [stdout] warning: function is never used: `test_try_proc`
[INFO] [stdout]   --> src/test_utils.rs:25:15
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub(crate) fn test_try_proc(
[INFO] [stdout]    |               ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `format_res`
[INFO] [stdout]   --> src/test_utils.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn format_res(res: &Result<String, String>) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `map_both`
[INFO] [stdout]   --> src/test_utils.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn map_both<T, U, F>(res: Result<T, T>, func: F) -> Result<U, U>
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7d901dc148d2aa36bceefa5850c97588e2f30111ffabae016b32603002586514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d901dc148d2aa36bceefa5850c97588e2f30111ffabae016b32603002586514", kill_on_drop: false }`
[INFO] [stdout] 7d901dc148d2aa36bceefa5850c97588e2f30111ffabae016b32603002586514