On 2/14/20, 'John Clements' via users-redirect wrote:
> I think I may understand what’s going on here, but a student and I worked on
> this for quite a while today before I found the problem.
> In this case, one easy error is to change the ‘cast’ into an ‘ann’, which
> works fine.
Your second suggestion is described in this (hard to find) section of
the TR Guide on Type Generalization:
I agree it should be much more prominent. At the very least, any docs
for invariant constructors should
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