D:\>perldoc -l warnings
C:\Perl_524\lib\warnings.pm

##</code><code>##

$ perldoc -l warnings
Can't locate Pod/Perldoc.pm in @INC ...

##</code><code>##

$ perl -Mwarnings -e 'print $INC{"warnings.pm"}'
/usr/share/perl5/core_perl/warnings.pm

##</code><code>##

D:\>perl -Mwarnings -e "print $INC{q'warnings.pm'}"
C:/Perl_524/lib/warnings.pm