Yecc bug

[Robert Virding]

There is a bug in yecc when using terminals whose names have characters 
which need \ escaping, for example the atom '\\'. The terminal atoms are 
generated without the extra "\" characters. This means that the 
generated .erl file will not compile correctly and the only fix is to go 
in by hand and add the "\" character.

The bug is in the function quoted_atom which used to generate the atom 
name string of terminals:

quoted_atom(Atom) ->
    [$'|atom_to_list(Atom)++"'"].

There are no problems using atoms like these in productions as the code 
for generating the productions use erl_pp:expr which does it right.

Robert