[Agda] Can rigid variables be treated as constructors/postulates?
arseniy.alekseyev at gmail.com
Mon Feb 18 15:57:03 CET 2013
I have the following example, which does not work:
module test (A B : Set) where
data U : Set where
a b : U
[_] : U → Set
[_] a = A
[_] b = B
f : ∀ u → [ u ] → U
f u _ = u
postulate x : A
zzz = f _ x
Here we have unresolved meta on the last line.
When we change A and B to be constructors with a data keyword (or
postulates), the meta gets resolved. It gets resolved because the
function [_] becomes constructor-headed (A and B become different
Does it make sense to treat rigid variables, such as A and B in the
example the same way constructors are treated? Why not?
A related, but separate issue:
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