Luc Maranget wrote:

> 
> Hello,
> 
> The warning (which you do not supply) attempt to be informative.
> 
> # ocamlc -w A alex.ml
> File "alex.ml", line 13, characters 4-5:
> Warning E: this pattern is fragile. It would hide
> the addition of new constructors to the data types it matches.

Got it! Makefile brain-damage on our part. We messed with the 
enabled/disable warnings and all of a sudden, without meaning to do it, 
we enable the E warning. This is why the warning, which used not to be 
flagged, suddenly began appearing.

Alex


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