I think it's not about precedence. 
my $c = 2;
my @a = ("$c", $c+=1);
print "@a";

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prints 2, 3

and 
my $c = 2;
my @a = ($c, $c+=1);
print "@a";

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prints 3, 3

Expressions in lists separated by comma guaranteed to be executed in right order, otherwise 
my ($a, $b) = (shift, shift)

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would not work
I think problem that some aliasing happening before assigment to @a

In reply to Re: Why does the first $c evaluate to the incremented value in [$c, $c += $_] ? by vsespb
in thread Why does the first $c evaluate to the incremented value in [$c, $c += $_] ? by smls

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