--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgo/misc/cgo/test/issue9510a/a.go	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,15 @@
+package issue9510a
+
+/*
+static double csquare(double a, double b) {
+	__complex__ double d;
+	__real__ d = a;
+	__imag__ d = b;
+	return __real__ (d * d);
+}
+*/
+import "C"
+
+func F(a, b float64) float64 {
+	return float64(C.csquare(C.double(a), C.double(b)))
+}