DB<83> use a::::b
Can't locate a//b.pm in @INC

##</code><code>##

C:\tmp\x\y>echo warn 'inside';1 >z.pm

##</code><code>##

  DB<5> use lib '.'

  DB<6> use x::::y::::z
inside at x//y///z.pm line 1.

##</code><code>##

  DB<7> use x::::y::::z

  DB<8> use x::::y::::::z
inside at x//y///z.pm line 1.
 at x//y///z.pm line 1.