===================================================
Missing default values for function parameters
===================================================

class A {
  constructor (a, b = ) {
    this.a = a
  }

  foo() {}
}

---

(program
  (class_declaration (identifier) (class_body
    (method_definition
      (property_identifier)
      (formal_parameters (identifier) (identifier) (ERROR))
      (statement_block (expression_statement (assignment_expression (member_expression (this) (property_identifier)) (identifier)))))
    (method_definition
      (property_identifier)
      (formal_parameters)
      (statement_block)))))

===================================================
Missing object-literal values
===================================================

{
  a: b,
  c:
}

---

(program (expression_statement (object
  (pair (property_identifier) (identifier))
  (pair (property_identifier) (MISSING identifier)))))

===================================================
Extra identifiers in expressions
===================================================

if (a b) {
  c d;
}
e f;

---

(program
  (if_statement
    (parenthesized_expression
      (identifier)
      (ERROR (identifier)))
    (statement_block
      (ERROR (identifier))
      (expression_statement (identifier))))
  (expression_statement
    (identifier)
    (ERROR (identifier))))

===================================================
Extra complex literals in expressions
===================================================

if ({a: 'b'} {c: 'd'}) {
  x = function(a) { b; } function(c) { d; }
}

---

(program
  (if_statement
    (parenthesized_expression
      (ERROR (object (pair (property_identifier) (string))))
      (object (pair (property_identifier) (string))))
    (statement_block
      (expression_statement
        (assignment_expression
          (identifier)
          (function (formal_parameters (identifier)) (statement_block (expression_statement (identifier)))))
        (MISSING ";"))
      (expression_statement
        (function (formal_parameters (identifier)) (statement_block (expression_statement (identifier))))))))

===================================================
Extra tokens at the end of the file
===================================================

// skip the equals sign
a.b =
---

(program
  (comment)
  (ERROR (member_expression (identifier) (property_identifier))))

===================================================
Errors after a sequence of function declarations
===================================================

/*
 * The JS grammar has an ambiguity such that these functions
 * can be parsed either as function declarations or as
 * function expressions. This ambiguity causes a lot of
 * splitting and merging in the parse stack. When iterating
 * the parse stack during an error repair, there would then
 * be a very large number (> 2^16) of paths through the parse
 * stack.
 */
function a() {}
function b() {}
function c() {}
function e() {}
function f() {}
function g() {}
function h() {}
function i() {}

var x = !!!

---

(program
  (comment)
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (function_declaration (identifier) (formal_parameters) (statement_block))
  (ERROR (identifier)))

=========================================================
Errors inside of a template string substitution
=========================================================

const a = `b c ${d += } f g`
const h = `i ${j(k} l`

---

(program
  (lexical_declaration
    (variable_declarator
      (identifier)
      (template_string (template_substitution
        (augmented_assignment_expression (identifier) (MISSING identifier))))))
  (lexical_declaration
    (variable_declarator
      (identifier)
      (template_string (template_substitution (call_expression
        (identifier)
        (arguments (identifier) (MISSING ")"))))))))

=========================================================
Long sequences of invalid tokens
=========================================================

function main(x) {
  console.log('a');
  what??????????????????????????????????????????????????
  console.log('b');
  return {};
}

---

(program
  (function_declaration
    (identifier)
    (formal_parameters (identifier))
    (statement_block
      (expression_statement
        (call_expression
          (member_expression (identifier) (property_identifier))
          (arguments (string))))
      (expression_statement
        (binary_expression
          (identifier)
          (ERROR)
          (call_expression
            (member_expression (identifier) (property_identifier))
            (arguments (string)))))
      (return_statement (object)))))