Fixed regression in markdown reader.

'(_hi_)' was being parsed with literal underscores (no emphasis).
The fix:  the 'str' parser now only parses alphanumerics and
embedded underscores.  All other symbols are handled by the
'symbol' parser.  This has a slight effect on the AST, since
you'll get [Str "hi",Str ":"] insntead of [Str "hi:"].  But there
should not be a visible effect in any of the writers.

Thanks to gwern for pointing out the regression.

0 files changed, 0 insertions, 0 deletions