fix "declared and not used" in tests;
also template/template.go, missed last time.

R=r
DELTA=116  (61 added, 10 deleted, 45 changed)
OCL=34620
CL=34622
diff --git a/test/fixedbugs/bug017.go b/test/fixedbugs/bug017.go
index eedc6d7..fdc986d 100644
--- a/test/fixedbugs/bug017.go
+++ b/test/fixedbugs/bug017.go
@@ -8,6 +8,7 @@
 
 func main() {
 	var s2 string = "\a\b\f\n\r\t\v";  // \r is miscompiled
+	_ = s2;
 }
 /*
 main.go.c: In function ‘main_main’: