[Bug c++/92158] Missed -Wsign-conversion in C++ when -1 enum converted to unsigned int

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92158

--- Comment #10 from Jonny Grant <jg at jguk dot org> ---
C++ 'enum class' gives a nice error for conversion to unsigned.

Example:

enum class E { a = 1 } ;
unsigned i = E::a;


I've asked this before, will just write again so it is on a ticket. I
understand C++ allows implicit conversion of enum's, it would be good to
generate a warning with the following example in C++. So I could make the
conversion explicit 

enum E { a = 1 } ;
unsigned i = a;