1 files changed, 33 insertions, 0 deletions
diff --git a/test/typeparam/issue50419.go b/test/typeparam/issue50419.go
new file mode 100644
index 0000000..dfe55f9
--- /dev/null
+++ b/test/typeparam/issue50419.go
@@ -0,0 +1,33 @@
+// run
+
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test that type substitution works correctly even for a method of a generic type
+// that has multiple blank type params.
+
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	foo := &Foo[string, int]{
+		valueA: "i am a string",
+		valueB: 123,
+	}
+	if got, want := fmt.Sprintln(foo), "i am a string 123\n"; got != want {
+		panic(fmt.Sprintf("got %s, want %s", got, want))
+	}
+}
+
+type Foo[T1 any, T2 any] struct {
+	valueA T1
+	valueB T2
+}
+
+func (f *Foo[_, _]) String() string {
+	return fmt.Sprintf("%v %v", f.valueA, f.valueB)
+}