proc `$`(lexer: Lexer): string {....raises: [], tags: [], forbids: [].}

proc addSource(filePath, content: string) {....raises: [], tags: [], forbids: [].}

proc clearIndent(lexer: Lexer) {....raises: [], tags: [], forbids: [].}

proc clearTokens(lexer: Lexer) {....raises: [], tags: [], forbids: [].}

proc dedentAll(lexer: Lexer) {....raises: [], tags: [], forbids: [].}

proc getSource(filePath: string; lineNo: int; res: var string): GetSourceRes {.
    ...raises: [], tags: [], forbids: [].}

proc lexString(lexer: Lexer; input: string; mode = Mode.File) {.
    ...raises: [SyntaxError:ObjectType], tags: [RootEffect], forbids: [].}

proc newLexer(fileName: string): Lexer {....raises: [], tags: [], forbids: [].}

proc newLexer(fileName: string; lineNo: int): Lexer {....raises: [], tags: [],
    forbids: [].}

proc newTokenNode(token: Token; lineNo = -1; colNo = -1; content = ""): TokenNode {.
    ...raises: [], tags: [], forbids: [].}