Comments (2)
Yes this is on purpose. Constructors can be overloaded/reused, so they can't have their type synthesized, only checked. Consider
data Unit => tt
data Bool => tt | ff
def x => tt
What type should x
have? It's unclear. Instead you'd have to write
def x : Unit => tt
or
def x : Bool => tt
Agda actually does exactly the same thing, except it has a special case where the type of a constructor can be inferred if it appears in only one datatype declaration. This could be added, but I don't think it's a big deal.
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Ah thanks, that explains it.
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