-- -*- M2-comint -*- {* hash: -101585665 *} i1 : (optionalSignParser @ constParser "abc" : charAnalyzer) "abc" o1 = (1, abc) o1 : Sequence i2 : (optionalSignParser @ constParser "abc" : charAnalyzer) "+abc" o2 = (1, abc) o2 : Sequence i3 : (optionalSignParser @ constParser "abc" : charAnalyzer) "-abc" o3 = (-1, abc) o3 : Sequence i4 :