f# - Unexpected keyword 'type' in implementation file -

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in vs 2008, f# 2.0, when compile ml script have error unexpected keyword 'type' in implementation file

#indent "off" pragma     type hw <'o,'m>   =   cat of <'m->'o>*<'m->'o>*<'o->'m>;

original

datatype ('o,'m) hw  =   cat of ('m->'o)*('m->'o)*('o->'m);

you wanted

type hw<'o,'m> = | cat of ('m -> 'o) * ('m -> 'o) * ('o -> 'm)

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