all: check and return an error if start index is out of range

1 files changed, 2 insertions, 0 deletions

diff --git a/script.go b/script.go
index 10c09a9..df669bd 100644
--- a/script.go
+++ b/script.go
@@ -68,6 +68,8 @@ func parseScript(env *environment, content []byte) (s *script, err error) {
 	}
 
 	stmts := bytes.Split(buf.Bytes(), []byte{'\n'})
+	// Add empty line at the beginning to make the start index start from
+	// 1, not 0.
 	stmts = append([][]byte{{}}, stmts...)
 
 	s = &script{