1 files changed, 56 insertions, 0 deletions
diff --git a/test/fixedbugs/issue56777.go b/test/fixedbugs/issue56777.go
new file mode 100644
index 0000000..8097ce9
--- /dev/null
+++ b/test/fixedbugs/issue56777.go
@@ -0,0 +1,56 @@
+// compile
+
+// 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.
+
+package p
+
+func fn(setText []rune, negate bool) int {
+	ranges := []singleRange{}
+
+	if len(setText) > 0 {
+		fillFirst := false
+		l := len(setText)
+		if negate {
+			if setText[0] == 0 {
+				setText = setText[1:]
+			} else {
+				l++
+				fillFirst = true
+			}
+		}
+
+		if l%2 == 0 {
+			ranges = make([]singleRange, l/2)
+		} else {
+			ranges = make([]singleRange, l/2+1)
+		}
+
+		first := true
+		if fillFirst {
+			ranges[0] = singleRange{first: 0}
+			first = false
+		}
+
+		i := 0
+		for _, r := range setText {
+			if first {
+				// lower bound in a new range
+				ranges[i] = singleRange{first: r}
+				first = false
+			} else {
+				ranges[i].last = r - 1
+				i++
+				first = true
+			}
+		}
+	}
+
+	return len(ranges)
+}
+
+type singleRange struct {
+	first rune
+	last  rune
+}