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07f5dcaac7
Test/lexer unicode pattern white space This PR adds a test for the Rust lexer to verify it correctly accepts vertical tab (`\x0B`) as valid whitespace between tokens. Vertical tab is part of Unicode Pattern_White_Space, which the Rust language specification uses to define whitespace. Related: Outreachy tracking [Pattern_White_Space](https://www.unicode.org/reports/tr31/#R3a)