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sub blah { ... blah(foo => 42, bar => "don't forget this", baz => 'oh!'); blah(foo => 42, baz => 'oh!'); # <-- will die()
$foo=42; print nameThatVariable($foo); # '$foo', of course. ... print nameThatVariable(do { my $tmp=23 }); # '$tmp'? print nameThatVariable([ 23,45 ]); # ?