Test failure in EventStream SSE

[kolbma]

Is anybody of you using EventStream SSE of Rocket and has seen any inexplicable outputs??!!

If you can give some hints see here...
rocket-org#5

Description

While the test response::stream::sse::sse_tests::test_heartbeat is repeated multiple times in the test garnish and has been always successful, I got now one time an assertion failed.

Is anybody of you using EventStream SSE of Rocket and has seen any inexplicable outputs??!!

The result of the test looks like a memory corruption or a race in setting memory boundaries:

failures:

---- response::stream::sse::sse_tests::test_heartbeat stdout ----
thread 'response::stream::sse::sse_tests::test_heartbeat' panicked at 'assertion failed: `(left == right)`
  left: `"data:hello\n:\n\n\n"`,
 right: `"data:hello\n\n"`', core/lib/src/response/stream/sse.rs:795:9


failures:
    response::stream::sse::sse_tests::test_heartbeat

test result: FAILED. 64 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.06s

https://github.com/kolbma/Rocket/blob/e365ab9ba423cf90864749318b548731ee9dc8d3/core/lib/src/response/stream/sse.rs#L792-L795