[C--] strange behaviour by qc--interp

I suspect I just don't know how to use qc--interp.
>From the documentation I found, it seems to expect an input file of lua 
commande generated by qc--.
qc-- has an option to generate such a file.
But when I execute

    qc-- -interp a.c-- -o a.qs -v

it says, "Translating a.c-- to a.qs", then remains silent a long time.

After a whil I control-C to kill it, and I find a file a.qs with what 
seems to be 57408696 bytes worth of copies of the line:

#! /usr/bin/env qc--interp

-- Puzzled,  hendrik

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