2463 – No line number in "statement is not reachable" warning

dmd test.d -w
warning - Error: statement is not reachable
=== test.d ===
void foo()
{
	assert(0);
	return 0;
}

Please remember to assign keywords to bug reports. To everybody reading this: Please look through issues you've reported and check for missing keywords.
This error is also an instance of issue 952.

It also hapens in more complicated situations. Out of curriosity I added -w to my project, and found few this "warning - Error: statment is not reachble" statments, and compilation failed. I have no idea where the problem is exactly, because this is big projects, with many templates.
What is interesting for some of this warning i have lines numbers like:
warning - corod.d(389): Error: statement is not reachable
but for most:
warning - Error: statement is not reachable
And i can't find good rule when I have line number and when i don't.
Small example:
$ dmd2 -w A.d 
warning - Error: statement is not reachable
=== A.d ====
class A {
	void f() {
		while (true) {}
		return 0;
	}
}

I forgot to add in my last Comment, that I'm using DMD 2.032

This is because statement.c, line 3515, at the end of ReturnStatement::semantic()
sets loc to zero.
//----
 if (exp && tbret->ty == Tvoid && !implicit0)
 {
	/* Replace:
	 *	return exp;
	 * with:
	 *	exp; return;
	 */
	Statement *s = new ExpStatement(loc, exp);
	exp = NULL;
	s = s->semantic(sc);
-	loc = 0;
	return new CompoundStatement(loc, s, this);
 }
 return this;
}

changeset 364

Fixed dmd 1.057 and 2.041