Missing polymorphic type has no line number

[Thierry Delisle]

The following code:

forall(otype type) {
struct T {
	int x, y;
};

T(type) foo() {
	return (T){1, 2};
}

produces an error with no line number:

error: Too few type arguments in generic type lvalue instance of struct T with body 1

[Rob Schluntz <rschlunt@…>]

In e82ef13:

Transfer location from typedef instance to actual type [fixes #97]