DISPLAY pragmas can match on patterns with wrong amount of arguments as seen in the following code:
data Nat : Set where
zero : Nat
suc : Nat → Nat
postulate
P : {A : Set} → A → Set
A : Set
{-# DISPLAY P (suc zero) = A #-}
_ : P suc
_ = zero
-- Nat !=< A
-- should be: Nat !=< P suc
The same happens with things swapped around:
{-# DISPLAY P suc = A #-}
_ : P (suc zero)
_ = zero
-- Nat !=< A
-- should be: Nat !=< P (suc zero)
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