__FILE__ works as bareword

[email protected] (Jim Avera)
Newsgroups perl.perl5.porters
Message-ID <[email protected]> 
This may have come up before, I don't recall.   Special tokens like 
__FILE__ are not interpolated if they appear in a position where a 
bareword hash key is allowed.

   perl -E 'my @a = (__FILE__ => 42); say $a[0];'     # v5.43.2
   >> __FILE__

Is this a bug?
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