C:\Users\ken\tmp>perl -v This is perl 5, version 26, subversion 3 (v5.26.3) built for MSWin32-x64-multi-thread ... C:\Users\ken\tmp>perl pm_11137628_pkg_sep_in_string.pl Name "user::s" used only once: possible typo at pm_11137628_pkg_sep_in_string.pl line 6. Use of uninitialized value $user::s in concatenation (.) or string at pm_11137628_pkg_sep_in_string.pl line 6. ... problem ...