test:refression test for https://github.com/goplus/llgo/issues/1370

Co-authored-by: xgopilot <noreply@goplus.org>
Co-authored-by: Claude <noreply@anthropic.com>

cl/_testdata/geometry1370/geometry.go

@@ -0,0 +1,25 @@
+package geometry1370
+
+type Shape interface {
+	Area() float64
+	validate() bool
+	setID(int)
+}
+
+type Rectangle struct {
+	Width, Height float64
+	id            int
+}
+
+func (r *Rectangle) Area() float64  { return r.Width * r.Height }
+func (r *Rectangle) validate() bool { return r.Width > 0 && r.Height > 0 }
+func (r *Rectangle) setID(id int)   { r.id = id }
+func (r *Rectangle) GetID() int     { return r.id }
+
+func NewRectangle(width, height float64) *Rectangle {
+	return &Rectangle{Width: width, Height: height}
+}
+
+func RegisterShape(s Shape, id int) {
+	s.setID(id)
+}