[Bug c++/52119] numeric_limits::min() is not a constant expression

[richard-gccbugzilla at metafoo dot co.uk]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52119

--- Comment #8 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> 
2012-02-13 22:17:27 UTC ---
Signed left shift which overflows the corresponding unsigned type is still
undefined, so g++ should reject this:

constexpr int n = 2 << 31;