[INFO] fetching crate rxr 0.1.11...
[INFO] testing rxr-0.1.11 against master#ec6f9a5b4413f74386267ef8efc93712c2ce6db6 for pr-155739
[INFO] extracting crate rxr 0.1.11 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate rxr 0.1.11
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate rxr 0.1.11
[INFO] tweaked toml for crates.io crate rxr 0.1.11 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rxr 0.1.11 on toolchain ec6f9a5b4413f74386267ef8efc93712c2ce6db6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rxr 0.1.11 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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.170
[INFO] [stderr]   Downloaded tokio v1.44.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2a0e081a1626d3354c94a5fcc5ee840640d0db04107d1429b34b76df6f3cf1e
[INFO] running `Command { std: "docker" "start" "-a" "b2a0e081a1626d3354c94a5fcc5ee840640d0db04107d1429b34b76df6f3cf1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2a0e081a1626d3354c94a5fcc5ee840640d0db04107d1429b34b76df6f3cf1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2a0e081a1626d3354c94a5fcc5ee840640d0db04107d1429b34b76df6f3cf1e", kill_on_drop: false }`
[INFO] [stdout] b2a0e081a1626d3354c94a5fcc5ee840640d0db04107d1429b34b76df6f3cf1e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7f4a280524f42c7cf86ab6d7cdc351250aa4b287a049079a9c97ac0dedd0c6f8
[INFO] running `Command { std: "docker" "start" "-a" "7f4a280524f42c7cf86ab6d7cdc351250aa4b287a049079a9c97ac0dedd0c6f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.69
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.38
[INFO] [stderr]    Compiling tokio-macros v2.5.0
[INFO] [stderr]    Compiling tokio v1.44.0
[INFO] [stderr]    Compiling rxr v0.1.11 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.15s
[INFO] running `Command { std: "docker" "inspect" "7f4a280524f42c7cf86ab6d7cdc351250aa4b287a049079a9c97ac0dedd0c6f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f4a280524f42c7cf86ab6d7cdc351250aa4b287a049079a9c97ac0dedd0c6f8", kill_on_drop: false }`
[INFO] [stdout] 7f4a280524f42c7cf86ab6d7cdc351250aa4b287a049079a9c97ac0dedd0c6f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 821f80f6dcf98344ef59709eefc9373f32de1c3a7adf3f2da38d0cc883847fda
[INFO] running `Command { std: "docker" "start" "-a" "821f80f6dcf98344ef59709eefc9373f32de1c3a7adf3f2da38d0cc883847fda", kill_on_drop: false }`
[INFO] [stderr]    Compiling rxr v0.1.11 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 9.28s
[INFO] running `Command { std: "docker" "inspect" "821f80f6dcf98344ef59709eefc9373f32de1c3a7adf3f2da38d0cc883847fda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "821f80f6dcf98344ef59709eefc9373f32de1c3a7adf3f2da38d0cc883847fda", kill_on_drop: false }`
[INFO] [stdout] 821f80f6dcf98344ef59709eefc9373f32de1c3a7adf3f2da38d0cc883847fda
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 5c60da5289b959dde89790b3cc9276d6b35b4c12a3093679fb7d41dbde83a8b5
[INFO] running `Command { std: "docker" "start" "-a" "5c60da5289b959dde89790b3cc9276d6b35b4c12a3093679fb7d41dbde83a8b5", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rxr-45e686abc8f46662)
[INFO] [stdout] 
[INFO] [stderr]      Running tests/async_subject.rs (/opt/rustwide/target/debug/deps/async_subject-38af393fbe09a54b)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test async_subject_complete_empty ... ok
[INFO] [stdout] test async_subject_error ... ok
[INFO] [stdout] test async_subject_error_empty ... ok
[INFO] [stdout] test async_subject_complete ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/behavior_subject.rs (/opt/rustwide/target/debug/deps/behavior_subject-f21422ccaef1eafd)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stderr]      Running tests/connectable.rs (/opt/rustwide/target/debug/deps/connectable-bdb7c802e80d11de)
[INFO] [stdout] test behavior_subject_emit_than_complete ... ok
[INFO] [stdout] test behaviour_subject_emit_than_error ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stderr]      Running tests/higher_order_operators.rs (/opt/rustwide/target/debug/deps/higher_order_operators-6d5e11b3223ec6bb)
[INFO] [stdout] test connectable_observable ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test switch_map_observable ... FAILED
[INFO] [stdout] test debounce_map_observable_notify_none ... ok
[INFO] [stdout] test debounce_map_observable_notify_all ... ok
[INFO] [stdout] test merge_map_observable ... ok
[INFO] [stdout] test concat_map_observable ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- switch_map_observable stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread '<unnamed>' (157) panicked at tests/higher_order_operators.rs:72:25:
[INFO] [stdout] switch_map did not unsubscribed inner observable properly.
[INFO] [stdout] Outer value is 2 which is not last value emitted by outer observable. Inner observable reached
[INFO] [stdout] 10 which is its last value
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5e376c8eb09a - std[29689e6404d28ef9]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5e376c8eb09a - std[29689e6404d28ef9]::backtrace_rs::backtrace::trace_unsynchronized::<std[29689e6404d28ef9]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5e376c8eb09a - std[29689e6404d28ef9]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5e376c8eb09a - <<std[29689e6404d28ef9]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[e929cb53b82a81ca]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5e376c8fef8a - <core[e929cb53b82a81ca]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5e376c8fef8a - core[e929cb53b82a81ca]::fmt::write
[INFO] [stdout]    6:     0x5e376c8ef922 - std[29689e6404d28ef9]::io::default_write_fmt::<alloc[9d7caffeb3b5d2c6]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/io/mod.rs:621:11
[INFO] [stdout]    7:     0x5e376c8ef922 - <alloc[9d7caffeb3b5d2c6]::vec::Vec<u8> as std[29689e6404d28ef9]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/io/mod.rs:1976:13
[INFO] [stdout]    8:     0x5e376c8c9bff - <std[29689e6404d28ef9]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5e376c8c9bff - std[29689e6404d28ef9]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5e376c8e3329 - std[29689e6404d28ef9]::panicking::default_hook
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5e376c7ad5cc - <alloc[9d7caffeb3b5d2c6]::boxed::Box<dyn for<'a, 'b> core[e929cb53b82a81ca]::ops::function::Fn<(&'a std[29689e6404d28ef9]::panic::PanicHookInfo<'b>,), Output = ()> + core[e929cb53b82a81ca]::marker::Send + core[e929cb53b82a81ca]::marker::Sync> as core[e929cb53b82a81ca]::ops::function::Fn<(&std[29689e6404d28ef9]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/alloc/src/boxed.rs:2285:9
[INFO] [stdout]   12:     0x5e376c7ad5cc - test[a24b3028667022f7]::test_main_inner::<test[a24b3028667022f7]::test_main_static::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/test/src/lib.rs:155:21
[INFO] [stdout]   13:     0x5e376c8e35a2 - <alloc[9d7caffeb3b5d2c6]::boxed::Box<dyn for<'a, 'b> core[e929cb53b82a81ca]::ops::function::Fn<(&'a std[29689e6404d28ef9]::panic::PanicHookInfo<'b>,), Output = ()> + core[e929cb53b82a81ca]::marker::Send + core[e929cb53b82a81ca]::marker::Sync> as core[e929cb53b82a81ca]::ops::function::Fn<(&std[29689e6404d28ef9]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/alloc/src/boxed.rs:2285:9
[INFO] [stdout]   14:     0x5e376c8e35a2 - std[29689e6404d28ef9]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5e376c8c9cb8 - std[29689e6404d28ef9]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x5e376c8beec9 - std[29689e6404d28ef9]::sys::backtrace::__rust_end_short_backtrace::<std[29689e6404d28ef9]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x5e376c8ca9cd - __rustc[3aed6af316653e63]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5e376c8ff74c - core[e929cb53b82a81ca]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5e376c78effc - higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}::{closure#0}
[INFO] [stdout]                                at /opt/rustwide/workdir/tests/higher_order_operators.rs:72:25
[INFO] [stdout]   20:     0x5e376c747612 - std[29689e6404d28ef9]::panicking::catch_unwind::do_call::<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}::{closure#0}, ()>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:581:40
[INFO] [stdout]   21:     0x5e376c72c6fb - __rust_try
[INFO] [stdout]   22:     0x5e376c72c57f - std[29689e6404d28ef9]::panicking::catch_unwind::<(), higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}::{closure#0}>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:544:19
[INFO] [stdout]   23:     0x5e376c72c57f - std[29689e6404d28ef9]::panic::catch_unwind::<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}::{closure#0}, ()>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panic.rs:359:14
[INFO] [stdout]   24:     0x5e376c7908e2 - higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}
[INFO] [stdout]                                at /opt/rustwide/workdir/tests/higher_order_operators.rs:71:60
[INFO] [stdout]   25:     0x5e376c759aef - higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable::<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}
[INFO] [stdout]                                at /opt/rustwide/workdir/tests/generate_observable/mod.rs:42:13
[INFO] [stdout]   26:     0x5e376c77ba96 - std[29689e6404d28ef9]::sys::backtrace::__rust_begin_short_backtrace::<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   27:     0x5e376c738447 - std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked::<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/thread/lifecycle.rs:70:13
[INFO] [stdout]   28:     0x5e376c752383 - <core[e929cb53b82a81ca]::panic::unwind_safe::AssertUnwindSafe<std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1}::{closure#0}> as core[e929cb53b82a81ca]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/core/src/panic/unwind_safe.rs:275:9
[INFO] [stdout]   29:     0x5e376c7464cc - std[29689e6404d28ef9]::panicking::catch_unwind::do_call::<core[e929cb53b82a81ca]::panic::unwind_safe::AssertUnwindSafe<std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:581:40
[INFO] [stdout]   30:     0x5e376c738bbb - __rust_try
[INFO] [stdout]   31:     0x5e376c73667c - std[29689e6404d28ef9]::panicking::catch_unwind::<(), core[e929cb53b82a81ca]::panic::unwind_safe::AssertUnwindSafe<std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panicking.rs:544:19
[INFO] [stdout]   32:     0x5e376c73667c - std[29689e6404d28ef9]::panic::catch_unwind::<core[e929cb53b82a81ca]::panic::unwind_safe::AssertUnwindSafe<std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/panic.rs:359:14
[INFO] [stdout]   33:     0x5e376c73667c - std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked::<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/thread/lifecycle.rs:68:26
[INFO] [stdout]   34:     0x5e376c740c0e - <std[29689e6404d28ef9]::thread::lifecycle::spawn_unchecked<higher_order_operators[7355bbd4612be55d]::generate_observable::generate_u32_observable<higher_order_operators[7355bbd4612be55d]::switch_map_observable::{closure#4}::{closure#0}>::{closure#0}::{closure#1}, ()>::{closure#1} as core[e929cb53b82a81ca]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   35:     0x5e376c8ea99f - <alloc[9d7caffeb3b5d2c6]::boxed::Box<dyn core[e929cb53b82a81ca]::ops::function::FnOnce<(), Output = ()> + core[e929cb53b82a81ca]::marker::Send> as core[e929cb53b82a81ca]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/alloc/src/boxed.rs:2271:9
[INFO] [stdout]   36:     0x5e376c8ea99f - <std[29689e6404d28ef9]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/ec6f9a5b4413f74386267ef8efc93712c2ce6db6/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   37:     0x737106792aa4 - <unknown>
[INFO] [stdout]   38:     0x73710681fa64 - clone
[INFO] [stdout]   39:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     switch_map_observable
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 4 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 25.13s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--test higher_order_operators`
[INFO] running `Command { std: "docker" "inspect" "5c60da5289b959dde89790b3cc9276d6b35b4c12a3093679fb7d41dbde83a8b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c60da5289b959dde89790b3cc9276d6b35b4c12a3093679fb7d41dbde83a8b5", kill_on_drop: false }`
[INFO] [stdout] 5c60da5289b959dde89790b3cc9276d6b35b4c12a3093679fb7d41dbde83a8b5
