Casting between Structs

[Jonathan Marler]

I reduced an issue in my project to this code snippet:

struct Struct1 { }
struct Struct2 { }

void func1(const Struct1);
void func2()
{
     Struct2 s;
     func1(cast(Struct1)s);
}


DMD compiles this just fine but according to the spec this should 
not compile. The spec 
(https://dlang.org/spec/expression.html#CastExpression section 8) 
says that "Casting a value v to a struct S, when value is not a 
struct of the same type, is equivalent to: S(v)", however, if I 
write Struct1(s) in this example, I get a compile error.

Is the spec wrong or is this a problem in the DMD compiler?

P.S. this snippet causes LDC to segfault 
(https://github.com/ldc-developers/ldc/issues/3314), but it's not 
clear whether it should be made to work like DMD, or if they 
should conform to the spec and make this a compile error