Optional parameter is not defaulted to null.

[andersjohnsen]

The following code give me this output

class Test<T> {
  T v() {
    T visit(var node, [T ifEmpty]) {
      if (node === null) return ifEmpty;
      return visit(null, "key");
    }
    visit("test");
  }
}

void main() {
  Test<int> t = new Test<int>();
  print(t.v());
}

++++++++++++++++++++++

./frog/frog.py test.dart
/tmp/tmpMtPmEW/out.js:14: Closure argument mismatch: Wrong number of arguments to function. Expected 2 positional arguments and at most 0 named arguments, but got 1 positional arguments and 0 named arguments.
  throw e;
        ^
Closure argument mismatch: Wrong number of arguments to function. Expected 2 positional arguments and at most 0 named arguments, but got 1 positional arguments and 0 named arguments.
    at /tmp/tmpMtPmEW/out.js:406:11
    at Function.<anonymous> (/tmp/tmpMtPmEW/out.js:141:25)
    at Test_int.v (/tmp/tmpMtPmEW/out.js:464:9)
    at main (/tmp/tmpMtPmEW/out.js:474:12)
    at /tmp/tmpMtPmEW/out.js:482:1

+++++++++++

While the specs says the following:

  "If no default is explicitly specified for an optional parameter, but a default could legally be provided, an implicit default of null is provided."

Thank you!

• Anders

[madsager]

Added Triaged label.

[anders-sandholm]

Removed Area-Frog label.
Added Area-Dart2JS, FromAreaFrog labels.

[kasperl]

Added WontFix label.