fixes elm#16

Implementation of deadEndsToString.

Author: bburdette

src/Parser.elm

@@ -168,8 +168,31 @@ _thinks_ is happening can be really helpful!
 -}
 deadEndsToString : List DeadEnd -> String
 deadEndsToString deadEnds =
-  "TODO deadEndsToString"
-
+  String.concat (List.intersperse "; " (List.map deadEndToString deadEnds))
+
+
+deadEndToString : DeadEnd -> String
+deadEndToString deadend = 
+  problemToString deadend.problem ++ " at row " ++ String.fromInt deadend.row ++ ", col " ++ String.fromInt deadend.col
+
+
+problemToString : Problem -> String 
+problemToString p = 
+  case p of 
+   Expecting s -> "expecting '" ++ s ++ "'"
+   ExpectingInt -> "expecting int" 
+   ExpectingHex -> "expecting hex" 
+   ExpectingOctal -> "expecting octal" 
+   ExpectingBinary -> "expecting binary" 
+   ExpectingFloat -> "expecting float" 
+   ExpectingNumber -> "expecting number" 
+   ExpectingVariable -> "expecting variable" 
+   ExpectingSymbol s -> "expecting symbol '" ++ s ++ "'"
+   ExpectingKeyword s -> "expecting keyword '" ++ s ++ "'"
+   ExpectingEnd -> "expecting end" 
+   UnexpectedChar -> "unexpected char" 
+   Problem s -> "problem " ++ s 
+   BadRepeat -> "bad repeat" 
 
 
 -- PIPELINES