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When encountering a "simpl nomatch" constant, the reduction machinery tries
to unfold it. If the subsequent partial reduction does not produce any
match construct, it keeps going from the reduced term. Unfortunately, the
reduced term has been refolded in the meantime, which means that some of
the previous reduction steps have been canceled, thus causing an infinite
loop. This patch delays the refolding till the very end, so that reduction
always progresses.
Disclaimer: I have no idea what I am doing here. The patch compiles the
standard library and the test suite properly, so hopefully they contain
enough tests to exercise the reduction machinery.
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