Cannot parse `some_fn(namespace\foo())`

[TysonAndre]

This is valid PHP, but parsing fails for this case.

php > var_export(namespace\is_string('x'));
true

Possibly caused by #165

Pretty-printed output of tolerant-php-parser: (unexpected MissingToken for closeParen)

» internal/dump_fallback_ast.php 'var_export(namespace\foo());'
Node\SourceFileNode
    statementList: Node\Statement\ExpressionStatement
        expression: Node\Expression\CallExpression
            callableExpression: Node\QualifiedName
                nameParts: Token: Name(2): "var_export"
            openParen: Token: OpenParenToken(203): "("
            closeParen: MissingToken: CloseParenToken(204): ""
        semicolon: MissingToken: SemicolonToken(237): ""
    statementList: Node\Statement\ExpressionStatement
        expression: Node\Expression\CallExpression
            callableExpression: Node\QualifiedName
                relativeSpecifier: Node\RelativeSpecifier
                    namespaceKeyword: Token: NamespaceKeyword(146): "namespace"
                    backslash: Token: BackslashToken(255): "\\"
                nameParts: Token: Name(2): "foo"
            openParen: Token: OpenParenToken(203): "("
            closeParen: Token: CloseParenToken(204): ")"
        semicolon: MissingToken: SemicolonToken(237): ""
    statementList: SkippedToken: CloseParenToken(204): ")"
    statementList: Node\Statement\EmptyStatement
        semicolon: Token: SemicolonToken(237): ";"
    endOfFileToken: Token: EndOfFileToken(1): ""

The same issue is also seen with global constants (e.g. when parsing src/PhpTokenizer.php):

» php internal/dump_fallback_ast.php '$x = [namespace\T_COALESCE_EQUAL => 2];'
Node\SourceFileNode
    statementList: Node\Statement\ExpressionStatement
        expression: Node\Expression\AssignmentExpression
            leftOperand: Node\Expression\Variable
                name: Token: VariableName(3): "$x"
            operator: Token: EqualsToken(238): " ="
            rightOperand: Node\Expression\ArrayCreationExpression
                openParenOrBracket: Token: OpenBracketToken(201): " ["
                closeParenOrBracket: MissingToken: CloseBracketToken(202): ""
        semicolon: MissingToken: SemicolonToken(237): ""
    statementList: Node\Statement\ExpressionStatement
        expression: Node\QualifiedName
            relativeSpecifier: Node\RelativeSpecifier
                namespaceKeyword: Token: NamespaceKeyword(146): "namespace"
                backslash: Token: BackslashToken(255): "\\"
            nameParts: Token: Name(2): "T_COALESCE_EQUAL"
        semicolon: MissingToken: SemicolonToken(237): ""
    statementList: SkippedToken: DoubleArrowToken(257): " =>"
    statementList: Node\Statement\ExpressionStatement
        expression: Node\NumericLiteral
            children: Token: IntegerLiteralToken(416): " 2"
        semicolon: MissingToken: SemicolonToken(237): ""
    statementList: SkippedToken: CloseBracketToken(202): "]"
    statementList: Node\Statement\EmptyStatement
        semicolon: Token: SemicolonToken(237): ";"
    endOfFileToken: Token: EndOfFileToken(1): ""