=over =item $^M X By default, running out of memory is an untrappable, fatal error. However, if suitably built, Perl can use the contents of C as an emergency memory pool after Cing. Suppose that your Perl were compiled with C and used Perl's malloc. Then $^M = 'a' x (1 file in the Perl distribution for information on how to add custom C compilation flags when compiling perl. To discourage casual use of this advanced feature, there is no L long name for this variable. This variable was added in Perl 5.004. =back