ast: fix error for 'struct embed is interface' (#13465)

vlib/v/ast/table.v

@@ -1384,7 +1384,7 @@ pub fn (t Table) does_type_implement_interface(typ Type, inter_typ Type) bool {
 		}
 		// verify methods
 		for imethod in inter_sym.info.methods {
-			if method := sym.find_method(imethod.name) {
+			if method := t.find_method_with_embeds(sym, imethod.name) {
 				msg := t.is_same_method(imethod, method)
 				if msg.len > 0 {
 					return false

vlib/v/tests/struct_embed_is_interface_test.v

@@ -0,0 +1,53 @@
+pub struct Base {
+mut:
+	x int
+	y int
+}
+
+pub fn (mut b Base) init() {}
+
+pub fn (b Base) get_pos() (int, int) {
+	return b.x, b.y
+}
+
+pub struct Label {
+	Base
+}
+
+pub interface Widget {
+mut:
+	init()
+}
+
+pub interface Layoutable {
+	get_pos() (int, int)
+}
+
+pub struct Layout {
+	Base
+mut:
+	widgets []Widget
+}
+
+pub fn (mut l Layout) layout() {
+	for wd in l.widgets {
+		if wd is Layoutable {
+			lw := wd as Layoutable
+			dump(lw.get_pos())
+			x, y := lw.get_pos()
+			assert x == 10
+			assert y == 20
+		} else {
+			println('wd is NOT Layoutable')
+		}
+	}
+}
+
+fn test_struct_embed_is_interface() {
+	mut l := Layout{}
+	l.widgets << Label{
+		x: 10
+		y: 20
+	}
+	l.layout()
+}