... it is not wise to use operator names for constants.

ceo: ... or for functions, which is what constants are:

>perl -wMstrict -le
"sub tr  (&$) { $_[0]->($_[1]) }
 sub trx (&$) { $_[0]->($_[1]) }
 ;;
 $_ = 'foo';
 print 'A: ', tr{ print qq{tr match: $_[0]} }/foo/;
 print 'B: ', trx{ print qq{trx match: $_[0]} }/foo/;
"
A: 0
trx match: 1
B: 1
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