fix #641: parsing of raw strings

Cython/Compiler/Parsing.py

@@ -766,13 +766,6 @@ def p_string_literal(s, kind_override=None):
                 has_non_ASCII_literal_characters = True
         elif sy == 'ESCAPE':
             if is_raw:
-                if systr == u'\\\n':
-                    chars.append(u'\\\n')
-                elif systr == u'\\\"':
-                    chars.append(u'"')
-                elif systr == u'\\\'':
-                    chars.append(u"'")
-                else:
                 chars.append(systr)
                 if is_python3_source and not has_non_ASCII_literal_characters \
                        and check_for_non_ascii_characters(systr):