try_filter_map causes stream to panic after an error is returned

[Kouzukii]

When try_filter_map() is used on a Stream of Results and an Error is returned, the stream becomes unusable.
Calling .next() on it afterwards results in a panic.

Related discussion on the rust forums: https://users.rust-lang.org/t/take-first-non-error-result-out-of-a-stream-of-results-in-rust/50897

Playground to reproduce the bug: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=82e01c4891d60df13a12528451d12225

[taiki-e]

Good catch! Seems there are the same bugs in try_skip_while and try_take_while.

[taiki-e]

Filed #2250 to fix this.