e1a2930893
`EmptyExpr` is somewhat unique, in that it's constructed in a circumstance where the parser has been looking for a particular token or string of tokens and has failed to find any. This means the parser state when constructing `EmptyExpr` is fairly unique. This gives rise to a bug where the parser constructs `EmptyExpr` with a backwards span - a `start` value that's beyond the `end` value. This likely happens because of the strange state the parser is in when recovering with `EmptyExpr`. This commit adds a backstop/workaround to avoid constructing such broken `EmptyExpr` spans (or any other kind of span). Eventually, the parser state should be fixed such that this does not occur, but that requires a significant change to the parser's functionality, so a simple fix in th interim is in order. PR Close #41581
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