[INFO] fetching crate tokio-scoped 0.2.0...
[INFO] checking tokio-scoped-0.2.0 against try#8ea250bdb76176ecb0225baa34aa634b024ae0e2 for pr-101692
[INFO] extracting crate tokio-scoped 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate tokio-scoped 0.2.0 on toolchain 8ea250bdb76176ecb0225baa34aa634b024ae0e2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8ea250bdb76176ecb0225baa34aa634b024ae0e2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tokio-scoped 0.2.0
[INFO] finished tweaking crates.io crate tokio-scoped 0.2.0
[INFO] tweaked toml for crates.io crate tokio-scoped 0.2.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8ea250bdb76176ecb0225baa34aa634b024ae0e2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8ea250bdb76176ecb0225baa34aa634b024ae0e2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+8ea250bdb76176ecb0225baa34aa634b024ae0e2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e9bad126d996fca695b2f7f5109f4ab6273adb689e6917124427751d88ba03b
[INFO] running `Command { std: "docker" "start" "-a" "6e9bad126d996fca695b2f7f5109f4ab6273adb689e6917124427751d88ba03b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e9bad126d996fca695b2f7f5109f4ab6273adb689e6917124427751d88ba03b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e9bad126d996fca695b2f7f5109f4ab6273adb689e6917124427751d88ba03b", kill_on_drop: false }`
[INFO] [stdout] 6e9bad126d996fca695b2f7f5109f4ab6273adb689e6917124427751d88ba03b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+8ea250bdb76176ecb0225baa34aa634b024ae0e2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ada0bb5dd8d1564a9ffb6053ef80411b5d75aaee6016c8e85390e7cf4ca1cc67
[INFO] running `Command { std: "docker" "start" "-a" "ada0bb5dd8d1564a9ffb6053ef80411b5d75aaee6016c8e85390e7cf4ca1cc67", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling futures-core v0.3.24
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking once_cell v1.14.0
[INFO] [stderr]    Compiling tokio v1.21.1
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]     Checking tokio-stream v0.1.9
[INFO] [stderr]     Checking tokio-scoped v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0391]: cycle detected when type-checking `testing::access_mut_stack`
[INFO] [stdout]    --> src/lib.rs:311:19
[INFO] [stdout]     |
[INFO] [stdout] 311 |             scope.spawn(async {
[INFO] [stdout]     |                   ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: ...which requires evaluating trait selection obligation `[generator interior@src/lib.rs:311:31: 316:14]: core::marker::Send`...
[INFO] [stdout] note: ...which requires generator glue MIR for `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires elaborating drops for `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires borrow-checking `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires processing `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires processing MIR for `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires unsafety-checking `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires building MIR for `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout] note: ...which requires type-checking `testing::access_mut_stack::{closure#0}::{closure#0}`...
[INFO] [stdout]    --> src/lib.rs:311:31
[INFO] [stdout]     |
[INFO] [stdout] 311 |               scope.spawn(async {
[INFO] [stdout]     |  _______________________________^
[INFO] [stdout] 312 | |                 let f = scoped.scope(|scope2| scope2.block_on(async { 4 }));
[INFO] [stdout] 313 | |                 assert_eq!(f, 4);
[INFO] [stdout] 314 | |                 tokio::time::sleep(Duration::from_millis(1000)).await;
[INFO] [stdout] 315 | |                 uncopy.push('!');
[INFO] [stdout] 316 | |             });
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     = note: ...which again requires type-checking `testing::access_mut_stack`, completing the cycle
[INFO] [stdout]     = note: cycle used when type-checking all item bodies
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0391`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tokio-scoped` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ada0bb5dd8d1564a9ffb6053ef80411b5d75aaee6016c8e85390e7cf4ca1cc67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ada0bb5dd8d1564a9ffb6053ef80411b5d75aaee6016c8e85390e7cf4ca1cc67", kill_on_drop: false }`
[INFO] [stdout] ada0bb5dd8d1564a9ffb6053ef80411b5d75aaee6016c8e85390e7cf4ca1cc67