$ perl -MO=Deparse -e    'sub Foo{};(time ? @y=() : $x) = Foo()' | perl
-e syntax OK
$ perl -MO=Deparse,-p -e 'sub Foo{};(time ? @y=() : $x) = Foo()' | perl
-e syntax OK
Assignment to both a list and a scalar at - line 4, near "))"
Execution of - aborted due to compilation errors.