typedef, Typedef

[bearophile]

This works if you compile with the -d switch:


void main() {
     typedef int T;
     T[10] a1;
     a1[] = 10;
     T[] a2 = [1, 2, 3];
     T[T] aa = [1:2, 3:4];
}



std.typecons.Typedef should replace the built-in typedef, but 
currently you can't use it in those cases:


void main() {
     import std.typecons: Typedef;
     alias T = Typedef!int;
     T[10] a1;
     a1[] = T(10); // OK
     a1[] = 10; // Error
     T[] a2 = [1, 2, 3]; // Error
     T[T] aa = [1:2, 3:4]; // Error
}


The problem with "a1[] = 10;":
http://d.puremagic.com/issues/show_bug.cgi?id=6523


But this use case is more important:
T[] a2 = [1, 2, 3];

Workarounds:
T[] a2 = [T(1), T(2), T(3)];
T[T] aa = [T(1):T(2), T(3):T(4)];
T[] a2 = [1, 2, 3].map!T.array;
T[T] aa = zip([1,3].map!T, [2,4].map!T).assocArray;


But both workarounds are bad when you have many items, a long 
name for the typedef, or your T is the type of the keys or values 
of an associative array.

Can this situation be fixed/improved?

Bye,
bearophile