You can only use a simple scalar variable as a foreach index. You could rewrite it to use the implicit index variable $_, but you could also just inline-declare a lexical variable which would exist only in the loop: 
foreach my $m (@modules) {
...
}

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Why the phobia about declaring a new variable?
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In reply to Re: syntax error on foreach by Roy Johnson
in thread syntax error on foreach by Anonymous Monk

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