1290 – Two ICEs, both involving real, imaginary, ? : and +=.

I think these are both manifestations of a single error: failing to detect a type mismatch. I think I've reported before that real+=complex compiles.
They should just issue a type mismatch error.
-------
void main()
{
 double a = 0;
 double b = 1;
 // Internal error: ..\ztc\cg87.c 3233
 a += (1? b: 1+1i)*1i;
 // Internal error: ..\ztc\cod2.c 1680
 a += (b?1:b-1i)*1i;
}

Fixed DMD 1.018 and DMD 2.002