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


  // comment
};
<<<
var set = <int>{
  // comment
};