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  1. or download this
    perl -MO=Deparse -wMstrict -e "{ package bla { *::x=\$a } }"
Name "main::x" used only once: possible typo at -e line 1.
...
  2. or download this
    perl -MO=Deparse -wMstrict -e "BEGIN { package bla { *::x=\$a } }"
# No problem