The necessary additions, to be placed after what is shown, are trivial

No. The trivial additions are most certainly wrong.

If F2 is exhausted first, the last line read from F1 inside the loop is lost, because $a is scoped to the block, and last leaves that block.

Perl 6 - the future is here, just unevenly distributed

In reply to Re^2: reading two files in parallel by moritz
in thread reading two files in parallel by baxy77bax

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