[Bug c++/109877] need to accept invalid tokens for balanced token sequences in attribute arguments

[iains at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109877

--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> ---
well,
 1. I've tried that challenge and they don't agree.
 2. this has been in the wild "forever" and is not going to be fixable, it just
gets worse.

Why is 
10.1.3
not the valid set of tokens
 integer
 period
 integer
 period
 integer
??
since period is a valid token.