diff options
Diffstat (limited to 'Fractran/Parser.hs')
| -rw-r--r-- | Fractran/Parser.hs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Fractran/Parser.hs b/Fractran/Parser.hs index 6d6cd86..95aa954 100644 --- a/Fractran/Parser.hs +++ b/Fractran/Parser.hs @@ -39,7 +39,8 @@ intPair = do return (numerator,denominator) -slash = char '/' +slash = char '/' + <?> "slash character" initVal = do @@ -59,7 +60,8 @@ positiveNumber = do return (read (firstDigit:rest)) -nonZeroDigit = oneOf "123456789" +nonZeroDigit = oneOf "123456789" + <?> "non-zero digit" whiteSpace = many (oneOf "\t\n\r ") |