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Auto merge of rust-lang#114115 - nnethercote:less-token-tree-cloning,…
… r=petrochenkov Less `TokenTree` cloning `TokenTreeCursor` has this comment on it: ``` // FIXME: Many uses of this can be replaced with by-reference iterator to avoid clones. ``` This PR completes that FIXME. It doesn't have much perf effect, but at least we now know that. r? `@petrochenkov`
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