type checking of constructor calls may probably be easily made slightly better

[DartBot]

This issue was originally filed by polux2001@gmail.com

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What steps will reproduce the problem?

1. click on "play" in http://try-dart-lang.appspot.com/s/k3Ie (code reproduced below in case it's not there anymore:)

class C1<A> {
  A x;
  C1(A x) { this.x = x; }
}

class C2<A> {
  A x;
  C2(this.x) {}
}

main() {
  C1<int> c1 = new C1<int>("a");
  C2<int> c2 = new C2<int>("a");
}

What is the expected output? What do you see instead?

I would expect the same warning for the two lines of the main function. Instead, only line 12 raises a warning.

[floitschG]

Added Area-Compiler, Triaged labels.

[DartBot]

This comment was originally written by @polux

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An even simpler example (no generics): http://try-dart-lang.appspot.com/s/UzEe

class C1 {
  int x;
  C1(int x) { this.x = x; }
}

class C2 {
  int x;
  C2(this.x) {}
}

main() {
  C1 c1 = new C1("a");
  C2 c2 = new C2("a");
}

[jtmcdole]

Initialization formals are of type dynamic, so no warning is correct for the C2(String). Marking this as a feature request.

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Set owner to @gbracha.
Removed Type-Defect, Area-Compiler labels.
Added Type-Enhancement, Area-Language labels.

[gbracha]

Added Duplicate label.
Marked as being merged into #464.