[MLton-user] withtype and and disparity
Wed, 17 Mar 2004 19:27:45 -0800
> The above code snip compiles in SML/NJ, does not in MLton.
> I don't know if there is bug or this is ambiguous area of the spec open
> to implementation interpretation. But I would like to be able to
> compile it or its equivalent in MLTon.
It is a deviation of SML/NJ from the Definition of SML that causes
SML/NJ to accept this program. This particular deviation is
SML/NJ does not expand the withtype derived form as described
by the Definition.
To make your code SML, you need to either manually expand the type of
alpha_node within alpha_network, which I would not recommend, or make
alpha_node and/or alpha_network datatypes, which I would recommend.
Actually, I would recommend making both of them datatypes.