1 files changed, 18 insertions, 0 deletions
diff --git a/testdata/signature.go b/testdata/signature.go
new file mode 100644
index 0000000..17cfd0b
--- /dev/null
+++ b/testdata/signature.go
@@ -0,0 +1,18 @@
+package main
+
+import "errors"
+
+func declareErrInSignature() error { // want "return signature should be '(err error)'"
+	var err error // Should use variable declared in signature
+
+	err = nil
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		err = errors.New("defer error")
+	}()
+
+	return nil // want "does not return 'err'"
+}