if hasRType(n, n.RType, "RType") {
		return n.RType
	}
	return mapRType(pos, n.X.Type())
}

// UnsafeSliceElemRType asserts that n is an "unsafe.Slice" operation,
// and returns an expression that yields the *runtime._type value
// representing the result slice type's element type.
func UnsafeSliceElemRType(pos src.XPos, n *ir.BinaryExpr) ir.Node {
	assertOp(n, ir.OUNSAFESLICE)
	if hasRType(n, n.RType, "RType") {