You need to turn on warning to see them...

    $ perl -Mstrict -cwe '*foo->()'
    Name "main::foo" used only once: possible typo at -e line 1.
    -e syntax OK

    $ perl -Mstrict -we '*foo->()'
    Name "main::foo" used only once: possible typo at -e line 1.
    Undefined subroutine &main::foo called at -e line 1.
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ihb

Read argumentation in its context!