DMD 2.045
---
import std.stdio;

struct B(alias _)
{
	void print() { writeln(&_); }
}

struct C(alias _)
{
	int i;
	void print() { writeln(&_); }
}

int main(string[] args)
{
	int a;

	auto b = B!(a)();
	writeln(&a);
	b.print();

	auto c = C!(a)();
	writeln(&a);
	c.print();
	
	return 0;
}

---
$ rdmd passByAlias.d
B75B5E54
B75B5E54
B75B5E54
804E358
end
zsh: segmentation fault  rdmd passByAlias.d
---

It seems that C having a field messes with what DMD thinks the _ alias refers to.