1 files changed, 43 insertions, 0 deletions
diff --git a/test/fixedbugs/issue23521.go b/test/fixedbugs/issue23521.go
new file mode 100644
index 0000000..159e032
--- /dev/null
+++ b/test/fixedbugs/issue23521.go
@@ -0,0 +1,43 @@
+// errorcheck -0 -m
+
+// Copyright 2018 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.
+
+// Issue 23521: improve early DCE for if without explicit else.
+
+package p
+
+//go:noinline
+func nonleaf() {}
+
+const truth = true
+
+func f() int { // ERROR "can inline f"
+	if truth {
+		return 0
+	}
+	// If everything below is removed, as it should,
+	// function f should be inlineable.
+	nonleaf()
+	for {
+		panic("")
+	}
+}
+
+func g() int { // ERROR "can inline g"
+	return f() // ERROR "inlining call to f"
+}
+
+func f2() int { // ERROR "can inline f2"
+	if !truth {
+		nonleaf()
+	} else {
+		return 0
+	}
+	panic("")
+}
+
+func g2() int { // ERROR "can inline g2"
+	return f2() // ERROR "inlining call to f2"
+}