Idris2/tests/idris2/misc/params002/ParamsPrint.idr

parameters {n : Nat}
           (a : Int)
  0 func : Bool -> Type
  func True = List Bool
  func False = List Nat

  getType : (b : Bool) -> func b
  getType False = [0,1,2]
  getType True = [True, True, True]

  prf : (b : Bool) -> Int -> func b
  prf b i = let i1 = getType b in ?whut
Implement new parameters syntax Previously, parameter block reused the same syntax as in Idris1: ``` parameters (v1 : t1, … , vn : tn) ``` Unfortunately this syntax presents some issues: - It does not allow to declare implicit parameters - It does not allow to specify which multiplicity to use - It is inconsistent with the syntax used for named arguments elsewhere in the language. This change fixes those three problems by borrowing the syntax for declaring type parameters in records: ``` parameters (v1 : t2) (v2 : t2) … (vn : tn) ``` It also enables other features like multiple declarations of arguments with the same type: ``` parameters (v1, v2 : Type) ``` 2021-04-19 19:48:53 +03:00			`parameters {n : Nat}`
			`(a : Int)`
			`0 func : Bool -> Type`
			`func True = List Bool`
			`func False = List Nat`

			`getType : (b : Bool) -> func b`
			`getType False = [0,1,2]`
			`getType True = [True, True, True]`

			`prf : (b : Bool) -> Int -> func b`
			`prf b i = let i1 = getType b in ?whut`