[Bug c++/70587] 0e1_p+0 should not be parsed as a single pp-number in C++14 and earlier

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70587

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Once more, with line breaks:

  when a GNU dialect of a standard is specified, all features supported by the
  compiler are enabled, even when those features change the meaning of the base
  standard.  As a result, some strict-conforming programs may be rejected.