[INFO] fetching crate singleton-attr 0.1.9...
[INFO] checking singleton-attr-0.1.9 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate singleton-attr 0.1.9 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate singleton-attr 0.1.9
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate singleton-attr 0.1.9
[INFO] tweaked toml for crates.io crate singleton-attr 0.1.9 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate singleton-attr 0.1.9 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate singleton-attr 0.1.9 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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded singleton-attr-proc-macro v0.1.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cc83274171cc055c5f5c84d0dab088cf41f0d975472b707ae0eda6d53621183e
[INFO] running `Command { std: "docker" "start" "-a" "cc83274171cc055c5f5c84d0dab088cf41f0d975472b707ae0eda6d53621183e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc83274171cc055c5f5c84d0dab088cf41f0d975472b707ae0eda6d53621183e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc83274171cc055c5f5c84d0dab088cf41f0d975472b707ae0eda6d53621183e", kill_on_drop: false }`
[INFO] [stdout] cc83274171cc055c5f5c84d0dab088cf41f0d975472b707ae0eda6d53621183e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 707df6995f095149b648c7b248be7f9f53fe3db0175ef3ba1532e88d62d020cd
[INFO] running `Command { std: "docker" "start" "-a" "707df6995f095149b648c7b248be7f9f53fe3db0175ef3ba1532e88d62d020cd", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.75
[INFO] [stderr]    Compiling singleton-attr-proc-macro v0.1.8
[INFO] [stderr]     Checking singleton-attr v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time`
[INFO] [stdout]  --> examples/03_safe_threads.rs:5:19
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{thread, time};
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time`
[INFO] [stdout]  --> examples/02_threads.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{thread, time};
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `rand`
[INFO] [stdout]   --> examples/02_threads.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 |         config.a = rand::random::<u32>();
[INFO] [stdout]    |                    ^^^^ use of unresolved module or unlinked crate `rand`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `rand`, use `cargo add rand` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `rand`
[INFO] [stdout]   --> examples/03_safe_threads.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |         config.a = rand::random::<u32>();
[INFO] [stdout]    |                    ^^^^ use of unresolved module or unlinked crate `rand`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `rand`, use `cargo add rand` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `rand`
[INFO] [stdout]   --> examples/03_safe_threads.rs:27:20
[INFO] [stdout]    |
[INFO] [stdout] 27 |         config.b = rand::random::<u32>();
[INFO] [stdout]    |                    ^^^^ use of unresolved module or unlinked crate `rand`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `rand`, use `cargo add rand` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Singleton`
[INFO] [stdout]  --> examples/03_safe_threads.rs:3:29
[INFO] [stdout]   |
[INFO] [stdout] 3 |     traits::{SafeSingleton, Singleton},
[INFO] [stdout]   |                             ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `rand`
[INFO] [stdout]   --> examples/02_threads.rs:21:20
[INFO] [stdout]    |
[INFO] [stdout] 21 |         config.b = rand::random::<u32>();
[INFO] [stdout]    |                    ^^^^ use of unresolved module or unlinked crate `rand`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `rand`, use `cargo add rand` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `singleton-attr` (example "03_safe_threads") due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `singleton-attr` (example "02_threads") due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "707df6995f095149b648c7b248be7f9f53fe3db0175ef3ba1532e88d62d020cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "707df6995f095149b648c7b248be7f9f53fe3db0175ef3ba1532e88d62d020cd", kill_on_drop: false }`
[INFO] [stdout] 707df6995f095149b648c7b248be7f9f53fe3db0175ef3ba1532e88d62d020cd