peek https://github.com/apple/swift-syntax/blob/main/Sources/SwiftParser/Lexer/Cursor.swift#L505

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is(offset;, at) https://github.com/apple/swift-syntax/blob/main/Sources/SwiftParser/Lexer/Cursor.swift#L538

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advance https://github.com/apple/swift-syntax/blob/main/Sources/SwiftParser/Lexer/Cursor.swift#L607