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synquid's Issues

Error with len > 3 but not len <= 3

Changing a line in the "list replicate" example on the ComCom website from:

replicate :: n: Nat -> x: a -> {List a | len _v == n}

to:

replicate :: x: a -> {List a | len _v == 4}

we see the following error:

/var/www/comcom/tmp/Synquid/0719913783814785/Synquid.sq:29: Error:
Cannot match shape 'Bool'
with shape '_'
when checking neq :: X1:_ -> X0:_ -> _
in
\x .
match neq ?? ?? with

If you instead use:

replicate :: x: a -> {List a | len _v == 3}

the following result is produced:

replicate = \x . Cons x (Cons x (Cons x Nil))

From my trivial investigation it appears that the simplifyContraint' function does not contain a case for one of the types being an LetT _ _ AnyT which I presume would constitute an empty constraint. This is me just guessing because it looks like simplifyContraint' already handles the AnyT case and that is the only RType whose pretty-printed shape could match "_" while also not being AnyT.

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