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my $_ should work, but local $_ would fail.

It's because the loop variable in a for loop is an alias to each element of the array. So the global $_ is an alias into @roles in this case. Assigning to global $_ assigns into the @roles array. local (despite the name) operates on global variables, providing a local value for them, but not really creating a new local variable. So even in the scope of local $_ assigning to $_ will assign into @roles.

It's a particular combination of Perl features which is normally fairly safe to use, but because apply_roles_to_package also happens to load modules (and thus run third-party code - i.e. code which is not part of Moo) it causes problems.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^7: Moo and Spreadsheet::ParseExcel by tobyink
in thread Moo and Spreadsheet::ParseExcel by karlgoethebier

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