Is the iterator returned by str::chars() fused?

1

Its documentation does not state what happens if I call next() after next() returns None. Should I call fuse() on it? I am writing some code that might call next() an extra time an want to be sure I cover all bases.

2

Yes, it implements FusedIterator:

https://doc.rust-lang.org/nightly/std/str/struct.Chars.html#impl-FusedIterator-for-Chars<'_>

3

Thanks, that is good to know.

4

According to the docs for FusedIterator in std::iter - Rust calling fuse() on already FusedIterator is a no-op, so you should just use fuse() when you need to ensure that behavior.

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