initial import

core/lang/lang.go

@@ -0,0 +1,16 @@
+package lang
+
+import "log"
+
+var Placeholder PlaceholderType
+
+type (
+	GenericType     = interface{}
+	PlaceholderType = struct{}
+)
+
+func Must(err error) {
+	if err != nil {
+		log.Fatal(err)
+	}
+}

core/lang/lang_test.go

@@ -0,0 +1,7 @@
+package lang
+
+import "testing"
+
+func TestMust(t *testing.T) {
+	Must(nil)
+}