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Validate source snippet when format input is raw string Fixes rust-lang/rust#114865 The issue occurred because the user's proc macro respanned the format arg to an unrelated multi-byte string and we ICE'd by landing in the middle of a multi-byte char. This PR adds validation that prevents the parser from trying to walk such obviously wrong snippets. Such validation already existed for non-raw strings. This PR adds it for raw strings as well.