reflect: allow Value.Set for slice->array, but not AssignableTo

Author: Ben Krieger

src/reflect/type.go

@@ -1001,14 +1001,6 @@ func (t *rawType) AssignableTo(u Type) bool {
 		return true
 	}
 
-	if u.Kind() == Array && t.Kind() == Slice {
-		return u.Elem().(*rawType) == t.Elem().(*rawType)
-	}
-
-	if (u.Kind() == Pointer && u.Elem().Kind() == Array) && t.Kind() == Slice {
-		return u.Elem().Elem().(*rawType) == t.Elem().(*rawType)
-	}
-
 	if u.Kind() == Interface && u.NumMethod() == 0 {
 		return true
 	}

src/reflect/value.go

@@ -1083,7 +1083,7 @@ func (it *MapIter) Next() bool {
 func (v Value) Set(x Value) {
 	v.checkAddressable()
 	v.checkRO()
-	if !x.typecode.AssignableTo(v.typecode) {
+	if !x.typecode.AssignableTo(v.typecode) && !x.typecode.ConvertibleTo(v.typecode) {
 		panic("reflect.Value.Set: value of type " + x.typecode.String() + " cannot be assigned to type " + v.typecode.String())
 	}