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$ perl -le " print foo bar "
Can't locate object method "foo" via package "bar" (perhaps you forgot
+ to load "bar"?) at -e line 1.
...

$ perl -e "warn bar->foo "
Can't locate object method "foo" via package "bar" (perhaps you forgot
+ to load "bar"?) at -e line 1.

$ perl -e "warn 'foo' 'bar' "
String found where operator expected at -e line 1, near "'foo' 'bar'"
        (Missing operator before  'bar'?)
...
Uncaught exception from user code:
        syntax error at -e line 1, near "'foo' 'bar'"
        Execution of -e aborted due to compilation errors.