Update: figured it out (simulthanks to Ikegami). Gotta reference the right package. Corrected solution:
sub map_pairs(&@) {
my $fn = shift;
my $pkg = caller;
map {
my $idx = $_ * 2;
no strict 'refs';
my ($a, $b)
= local (${$pkg.'::a'}, ${$pkg.'::b'})
= (@_[$idx,$idx+1]);
$fn->($a, $b);
} (0..$#_/2);
}
Previous, erroneous solution follows.
I think you made this harder than it needs to be. Isn't this equivalent?
sub map_pairs(&@) {
my $fn = shift;
map {
my $idx = $_ * 2;
local ($a, $b) = @_[$idx,$idx+1];
$fn->($a, $b);
} (0..$#_/2);
}
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