40 columns                              |
>>> indented line comment (dartbug.com/16383)
var map = {
  // comment
};
<<<
var map = {
  // comment
};
>>> line comment on opening line
var map = { // comment
};
<<<
var map = {
  // comment
};
>>> indented block comment
var map = {
  /* comment */
};
<<<
var map = {
  /* comment */
};
>>> block comment with trailing newline
var map = {/* comment */
};
<<<
var map = {
  /* comment */
};
>>> block comment with leading newline
var map = {
  /* comment */};
<<<
var map = {
  /* comment */
};
>>> inline block comment
var map = {  /* comment */  };
<<<
var map = {/* comment */};
>>> multiple comments on opening line
var map = { /* first */ // second
};
<<<
var map = {
  /* first */ // second
};
>>> multiple inline block comments
var map = {  /* 1 */   /* 2 */   /* 3 */  };
<<<
var map = {/* 1 */ /* 2 */ /* 3 */};
>>> multiline trailing block comment
var map = {  /* comment
*/  };
<<<
var map = {
  /* comment
*/
};
>>> line comment between items
var map = {'a': 'b', // comment
  'c': 'd'};
<<<
var map = {
  'a': 'b', // comment
  'c': 'd'
};
>>> line comments after last item
var map = {'a': 'b' // 1
  // 2
};
<<<
var map = {
  'a': 'b' // 1
  // 2
};
>>> line comments after trailing comma
var map = {'a': 'b', // 1
  // 2
};
<<<
var map = {
  'a': 'b', // 1
  // 2
};
>>> inside map literal
var map = {
  // comment
  'foo': 1};
<<<
var map = {
  // comment
  'foo': 1
};
>>> remove blank line before beginning of body
var map = {


  // comment
};
<<<
var map = {
  // comment
};