...It certainly aliases $1 and this is certainly not a good idea, but matching is not broken. (Please see example code below.) ... This is just the way aliasing works

this is just the way something works is the weakest of argument ...

AnomalousMonk , its a bug, warnings doesn't warn

It never occurred to me to try using $1 for anything other than retrieving regex matches

It never even occurred to me to try $1='something' but you can't do that

This is not a feature, its just an oversight

warnings should help the idiot who uses $1 for something other than retrieving regex matches

documentation updates are not any kind of solution

$ perl -le" for my $1 ( 666 ){ print $1 } "
Can't use global $1 in "my" at -e line 1, near "my $1 "
Execution of -e aborted due to compilation errors.
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