Make initializing formals introduce a name to the initialization list.

[lrhn]

Currently
 class C {
   int x;
   int y;
   C(this.x) : y = x + 1;
 }
will not work, because the last "x" refers to neither the field "x" (since this" is not in scope of the initializers) or the argument "x" (since an initializing formal doesn't introduce a name).

I sometimes want to both initialize a field and use the value to initialize another (arguably redundant) field or to create a super-parameter.
In those cases, it would be nice if the code above would allow the last "x" to refer to the parameter (which would be a parameter reference, and not a this-reference). The variable's scope should not be extended to the constructor body, just to the initializer list.

Instead I have to make the parameter non-initializing and add a redundant "this.x=x," to the initializer list.

[gbracha]

Set owner to @gbracha.
Added Accepted label.

[gbracha]

The this.x syntax is a sugar intended for simple cases. You can write a classic constructor in that case.

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Added WontFix label.

[lrhn]

It was added eventually.