It seems a cast does more than change the static type and VRP.
```d
void foo(uint) { }
int x = -1;
foo(x); // compiles (debatable)
foo(long(x)); // compiles(!)
foo(cast(long)x); // compiles(!)
foo((() => cast(long)x)()); // Error: foo is not callable using
argument types […]
```
Why do the latter two work? Their static type is `long` which
normally rules out conversion to `uint`. However, if VRP can
prove the value is definitely in the range of `uint`, the
implicit conversion to `uint` is possible. However, VRP shouldn’t
say that that’s the case, since `int` supports negative numbers
and `uint` doesn’t.
