Error parsing enum containing hexadecimal initalizer for an enumeration constant

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What steps will reproduce the problem?
1. try to parse attached file.

What is the expected output? What do you see instead?
You can see an exception:

parsing exception occured while parsing 'literal' expected 
'skip(ident_next_char^)'  at 
line number 0, and character number 13
enum a{ B = 0x1} C
             ^

What version of the product are you using? On what operating system?
sept-9-2009-source

Rootcause:
What is happening is, that the 0x1 hexadecimal value is parsed as an 
octal_literal("0") and not as a hex_literal("0x1"). The cause is, that in the 
place of unsigned_literal, the octal_literal is checked first, and that breaks 
the compiler paradigm of searching the longest possible token string.

Proposed fix:
the simplest way to fix this issue is to re-arrange the parsing order from:

            unsigned_literal
                = decimal_literal
                | octal_literal
                | hex_literal;

to:

            unsigned_literal
                = decimal_literal
                | hex_literal
                | octal_literal;

this way the hex literal(which is always longer because of "0x" factor) will be 
parsed before octal. 

Original issue reported on code.google.com by [e-mail] on 15 Oct 2013 at 3:02

Attachments:

• test.h