Don’t deparse formats with #line directives

$ perl5.20.1 -mO=Deparse,-l -e 'format =' -e\@ -e'$foo' -e.
format STDOUT =
@
$foo
.
-e syntax OK
$ ./perl -Ilib -mO=Deparse,-l -e 'format =' -e\@ -e'$foo' -e.
format STDOUT =
@

#line 3 "-e"
; $foo
.
-e syntax OK

The second is not valid syntax.

I probably broke that when fixing BEGIN blocks.