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Expose size_hint() for TokenStream's iterator #334

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merged 2 commits into from Jul 25, 2022
Merged

Expose size_hint() for TokenStream's iterator #334

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f427365
Add test of ineffective TokenStream size_hint
dtolnay Jul 25, 2022
25a20e0
Expose size_hint() for TokenStream's iterator
dtolnay Jul 25, 2022
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4 changes: 4 additions & 0 deletions src/lib.rs
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Expand Up @@ -1290,6 +1290,10 @@ pub mod token_stream {
fn next(&mut self) -> Option<TokenTree> {
self.inner.next()
}

fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
}

impl Debug for IntoIter {
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7 changes: 7 additions & 0 deletions tests/test.rs
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Expand Up @@ -547,6 +547,13 @@ fn default_tokenstream_is_empty() {
assert!(default_token_stream.is_empty());
}

#[test]
fn tokenstream_size_hint() {
let tokens = "a b (c d) e".parse::<TokenStream>().unwrap();

assert_eq!(tokens.into_iter().size_hint(), (4, Some(4)));
}

#[test]
fn tuple_indexing() {
// This behavior may change depending on https://github.com/rust-lang/rust/pull/71322
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