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authorKevin Mehall <[email protected]>2021-03-06 16:36:22 +0000
committerKevin Mehall <[email protected]>2021-03-06 16:48:08 +0000
commit632fa8ef4a3c9e7440b79e04a9f7dd9bd23a4de4 (patch)
tree61dfaffb6b23173f53a7796dc6dfa80b50ef8726 /crates/hir_ty
parent750d3cb84678b23a55092f2e4726e48ead37a9ff (diff)
Fix TokenStream::from_str for input consisting of a single Group
TokenStream holds a `tt::Subtree` but assumes its `delimiter` is always `None`. In particular, the iterator implementation iterates over the inner `token_trees` and ignores the `delimiter`. However, `TokenStream::from_str` violated this assumption when the input consists of a single Group by producing a Subtree with an outer delimiter, which was ignored as seen by a procedural macro. In this case, wrap an extra level of Subtree around it. Fixes #7810 Fixes #7875
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