compiler/cl/_testgo: add tpinst

compiler/cl/_testgo/tpinst/main.go

@@ -0,0 +1,37 @@
+package main
+
+type M[T interface{}] struct {
+	v T
+}
+
+func (pt *M[T]) Value() T {
+	return pt.v
+}
+
+func (pt *M[T]) value() T {
+	return pt.v
+}
+
+type I[T interface{}] interface {
+	Value() T
+}
+
+func demo() {
+	var v1 I[int] = &M[int]{100}
+	if v1.Value() != 100 {
+		panic("error")
+	}
+
+	var v2 I[float64] = &M[float64]{100.1}
+	if v2.Value() != 100.1 {
+		panic("error")
+	}
+
+	if v1.(interface{ value() int }).value() != 100 {
+		panic("error")
+	}
+}
+
+func main() {
+	demo()
+}