fix: compose recursion

_test/struct46.go

@@ -0,0 +1,21 @@
+package main
+
+import "fmt"
+
+type A struct {
+	B string
+	C D
+}
+
+type D struct {
+	E *A
+}
+
+func main() {
+	a := &A{B: "b"}
+	a.C = D{E: a}
+	fmt.Println(a.C.E.B)
+}
+
+// Output:
+// b

interp/run.go

@@ -1860,9 +1860,12 @@ func doCompositeSparse(n *node, hasType bool) {
 		c1 := c.child[1]
 		field := n.typ.fieldIndex(c.child[0].ident)
 		convertLiteralValue(c1, n.typ.field[field].typ.TypeOf())
-		if c1.typ.cat == funcT {
+		switch {
+		case c1.typ.cat == funcT:
 			values[field] = genFunctionWrapper(c1)
-		} else {
+		case isRecursiveStruct(n.typ.field[field].typ, n.typ.field[field].typ.rtype):
+			values[field] = genValueInterfacePtr(c1)
+		default:
 			values[field] = genValue(c1)
 		}
 	}