Bugfix for empty list

src/Parse.hs

@@ -72,7 +72,7 @@ shelltestfile = do
   trailingComments <- many whitespaceorcommentline
   ptrace_ "shelltestfile 2"
   eof
-  let ts' = init ts ++ [(last ts) { trailingComments = trailingComments }]
+  let ts' = appendTrailingComments trailingComments ts
   ptrace "shelltestfile ." ts'
   return ts'
 
@@ -328,6 +328,11 @@ delimiterNotNewTest3 = do
 ----------------------------------------------------------------------
 -- common
 
+appendTrailingComments :: [String] -> [ShellTest] -> [ShellTest]
+appendTrailingComments _ [] = [] -- in this case, trailing comment are discarded
+appendTrailingComments cs ts =
+      init ts ++ [(last ts) { trailingComments = cs }]
+
 linesBetween :: [String] -> [String] -> Parser String
 linesBetween startdelims enddelims = do
   let delimp "" = string ""