Fix handling of parameter frame positions

interp/cfg.go

@@ -639,9 +639,9 @@ func (interp *Interpreter) Cfg(root *Node) []*Node {
 			n.flen = scope.size + 1
 			if len(n.child[0].child) > 0 {
 				// Method: restore receiver frame location (used at run)
-				list := []int{n.child[0].child[0].child[0].findex}
-				n.framepos = append(list, n.child[2].framepos...)
+				n.framepos = append(n.framepos, n.child[0].child[0].child[0].findex)
 			}
+			n.framepos = append(n.framepos, n.child[2].framepos...)
 			scope = scope.pop()
 			funcName := n.child[1].ident
 			if canExport(funcName) {

interp/run.go

@@ -432,10 +432,9 @@ func (n *Node) wrapNode(in []reflect.Value) []reflect.Value {
 	}
 
 	// Unwrap input arguments from their reflect value and store them in the frame
-	paramIndex := def.child[2].child[0].val.([]int)
 	i := 0
 	for _, arg := range in {
-		frame.data[paramIndex[i]] = arg
+		frame.data[def.framepos[i]] = arg
 		i++
 	}