From a58a2bd521442ecde2642a1ca5980091dafcba45 Mon Sep 17 00:00:00 2001
From: Daniel Whitenack <whitenack.daniel@gmail.com>
Date: Fri, 25 Nov 2016 14:32:13 -0500
Subject: [PATCH] fix error output, when execution err is nil

---
 internal/repl/repl.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/internal/repl/repl.go b/internal/repl/repl.go
index 089ac9a..b567193 100644
--- a/internal/repl/repl.go
+++ b/internal/repl/repl.go
@@ -391,7 +391,7 @@ func (s *Session) Eval(in string) (string, bytes.Buffer, error) {
 	s.doQuickFix()
 
 	output, stderr, runErr := s.Run()
-	if runErr != nil {
+	if runErr != nil || stderr.String() != "" {
 		if exitErr, ok := runErr.(*exec.ExitError); ok {
 			// if failed with status 2, remove the last statement
 			if st, ok := exitErr.ProcessState.Sys().(syscall.WaitStatus); ok {
@@ -418,6 +418,11 @@ func (s *Session) Eval(in string) (string, bytes.Buffer, error) {
 		return string(output), stderr, err
 	}
 
+	// Catch any unexpected stderr.
+	if stderr.String() != "" {
+		runErr = errors.New("Unexpected stderr from execution")
+	}
+
 	return string(output), stderr, runErr
 }