[issue10785] parser: store the filename as an unicode object

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> maybe a more elegant solution than changing the type conditional 
> on PGEN can be found

In pgen, the filename is only used to display the following warning, in indenterror():

   <filename>: inconsistent use of tabs and spaces in indentation

In pratical, this warning never occurs on Grammar/Grammar: this file doesn't use indentation at all, only continuation lines.

A better solution is maybe just to drop the filename for pgen. Anyway, pgen only compiles *one* file (Grammar/Grammar), so we don't need the input filename ;-)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10785>
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