[Bug c++/125656] "warning: left shift count >= width of type [-Wshift-count-overflow]" inaccurate

[mattreecebentley at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125656

--- Comment #6 from Matt Bentley <mattreecebentley at gmail dot com> ---
Created attachment 64670
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64670&action=edit
Code

Here's the code. I modified the relevant section so it'll trigger the warning
regardless of the C++ version or bitset size. 
Function causing the issue is 'set_overflow_to_one'