Initial commit: Go 1.23 release state

test/fixedbugs/issue9521.go

@@ -0,0 +1,18 @@
+// errorcheck
+
+// Copyright 2015 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 an incorrect use of the blank identifier is caught.
+// Does not compile.
+
+package main
+
+func f() (_, _ []int)         { return }
+func g() (x []int, y float64) { return }
+
+func main() {
+	_ = append(f()) // ERROR "cannot use \[\]int value as type int in append|cannot use.*type \[\]int.*to append"
+	_ = append(g()) // ERROR "cannot use float64 value as type int in append|cannot use.*type float64.*to append"
+}