Silence "used only once" warning in porting test #23284
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As suggested by Dave M. in Perl#23278 (comment).
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This works. An alternative is to change test.pl to be
$::IS_ASCII = $::IS_ASCII = ord 'A' == 65;
$::IS_EBCDIC = $::IS_EBCDIC = ord 'A' == 193;
And then the individual .t files wouldn't have to do anything special.
But I don't know which is better. Maybe they should have to declare their use of this as the better practice.
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As suggested by Dave M. in
#23278 (comment).
@iabyn