Missing warning for duplicate parameters

[DanTup]

The following code doesn't generate any warnings:

class MyClass {
  String name;
  String doc;

  MyClass(String name, String doc, this.doc);
}

main() {
  var a = new MyClass("test", "test", "test");
  print(a.name);
}

However it gives this error when run:

c:\Users\danny\Desktop\DartSample>dart test.dart
'file:///c:/Users/danny/Desktop/DartSample/test.dart': error: line 5 pos 41: duplicate formal parameter 'doc'
  MyClass(String name, String doc, this.doc);

Presumably there should be a warning about the duplicate parameters.

[eernstg]

Thanks for the report! However, this issue is currently being resolved:

As per #26655, we are introducing the ability to access initializing formal parameters (like the third parameter this.doc in your example) in the initializer list. This makes the behavior of dart correct (there will be a name clash), and the analyzer will be updated to diagnose this kind of name clash as a compile time error.

[lrhn]

So this issue is effectively a duplicate of #26658.