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(~) $ perl -Mstrict -e '$foo = 'bar'; print $foo . $/;'
Global symbol "$foo" requires explicit package name at -e line 1.
Global symbol "$foo" requires explicit package name at -e line 1.
Bareword "bar" not allowed while "strict subs" in use at -e line 1.
Execution of -e aborted due to compilation errors.

(~) $ perl -Mstrict -e '$foo = "bar"; print $foo . $/;'
Global symbol "$foo" requires explicit package name at -e line 1.
Global symbol "$foo" requires explicit package name at -e line 1.
Execution of -e aborted due to compilation errors.