Bug 5897 – unrelated struct type casting should ignite construction

http://www.digitalmars.com/d/2.0/expression.html > Casting a value v to a struct S, when value is not a struct of the same type, is > equivalent to: > > S(v) This spec explanation includes constructor call in D2, not only static opCall. But current dmd implementation is not. Following code compilation fails with -version=ctor. ---- struct A{ int n; } struct B{ int n, m; version(ctor) { this(A a){ n = a.n, m = a.n*2; } } else { static B opCall(A a) { B b; b.n = a.n, b.m = a.n*2; return b; } } } void main() { auto a = A(10); auto b = cast(B)a; assert(b.n == 10 && b.m == 20); } ----

Patch posted: https://github.com/D-Programming-Language/dmd/pull/47