mirror of https://github.com/rust-lang/rust
33 lines
682 B
Rust
33 lines
682 B
Rust
//@ run-pass
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//@ compile-flags:-Zmir-opt-level=3
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struct Cursor {}
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struct TokenTree {}
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impl Iterator for Cursor {
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type Item = TokenTree;
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fn next(&mut self) -> Option<TokenTree> {
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None
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}
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}
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fn tokenstream_probably_equal_for_proc_macro() {
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fn break_tokens(_tree: TokenTree) -> impl Iterator<Item = TokenTree> {
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let token_trees: Vec<TokenTree> = vec![];
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token_trees.into_iter()
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}
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let c1 = Cursor {};
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let c2 = Cursor {};
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let mut t1 = c1.flat_map(break_tokens);
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let mut t2 = c2.flat_map(break_tokens);
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for (_t1, _t2) in t1.by_ref().zip(t2.by_ref()) {}
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}
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fn main() {
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tokenstream_probably_equal_for_proc_macro();
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}
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