=over =item ${^WARNING_BITS} X<${^WARNING_BITS}> The current set of warning checks enabled by the C pragma. It has the same scoping as the C<$^H> and C<%^H> variables. The exact values are considered internal to the L pragma and may change between versions of Perl. Each time a statement completes being compiled, the current value of C<${^WARNING_BITS}> is stored with that statement, and can later be retrieved via C<(caller($level))[9]>. This variable was added in Perl v5.6.0. =back