Allow usage of constructor field parameters in constructor initializer list

[BlackHC]

class A {
 final x;
 final y;

 A(this.x) : y = x;
}

does not work (with "Only static members can be accessed in initializers"). It should...

[lrhn]

Effectively a duplicate of #15346.

I personally agree that this.x should also introduce x as a variable in the initializer list.

[filiph]

I agree. This has been bothering me for some time.

A more real-life example:

class Student {
  final String fullName, firstName, middleInitial, lastName;
  Student(this.firstName, this.middleInitial, this.lastName)
      : fullName = "$firstName $middleInitial $lastName";  // Error
}

This currently needs to be rewritten to the code below:

class Student {
  final String fullName, firstName, middleInitial, lastName;
  Student(String firstName, String middleInitial, String lastName)
      : firstName = firstName,
        middleInitial = middleInitial,
        lastName = lastName,
        fullName = "$firstName $middleInitial $lastName";
}

... or one needs to a) make fullName not final or b) use a getter.

[floitschG]

Closing as duplicate of #15346.