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authorNadrieril2019-05-06 23:17:26 +0200
committerNadrieril2019-05-06 23:20:47 +0200
commit60129b7d1c0ea8bdf2ec666fa51957e97465e88f (patch)
tree2118155537989a1a3bfa6c51b5c476651a0ef93e /dhall/src/errors/NotAFunction.txt
parent423fdeebe9247b16744fae4b50df415bbd08be04 (diff)
Consolidate errors in the error module
Diffstat (limited to 'dhall/src/errors/NotAFunction.txt')
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-Explanation: A function can return an output "term" that has a given "type",
-like this:
-
-
- ┌────────────────────┐
- │ ∀(x : Text) → Bool │ This is the type of a function that returns an
- └────────────────────┘ output term that has type ❰Bool❱
- ⇧
- This is the type of the output term
-
-
- ┌────────────────┐
- │ Bool → Integer │ This is the type of a function that returns an output
- └────────────────┘ term that has type ❰Int❱
- ⇧
- This is the type of the output term
-
-
-... or a function can return an output "type" that has a given "kind", like
-this:
-
- ┌────────────────────┐
- │ ∀(a : Type) → Type │ This is the type of a function that returns an
- └────────────────────┘ output type that has kind ❰Type❱
- ⇧
- This is the kind of the output type
-
-
- ┌──────────────────────┐
- │ (Type → Type) → Type │ This is the type of a function that returns an
- └──────────────────────┘ output type that has kind ❰Type❱
- ⇧
- This is the kind of the output type
-
-
-Other outputs are $_NOT valid, like this:
-
-
- ┌─────────────────┐
- │ ∀(x : Bool) → x │ ❰x❱ is a "term" and not a "type" nor a "kind" so the
- └─────────────────┘ output cannot have "type" ❰x❱ or "kind" ❰x❱
- ⇧
- This is not a type or kind
-
-
- ┌─────────────┐
- │ Text → True │ ❰True❱ is a "term" and not a "type" nor a "kind" so the
- └─────────────┘ output cannot have "type" ❰True❱ or "kind" ❰True❱
- ⇧
- This is not a type or kind
-
-
-You specified that your function outputs a:
-
-↳ $txt
-
-... which is neither a type nor a kind:
-
-Some common reasons why you might get this error:
-
-● You use ❰∀❱ instead of ❰λ❱ by mistake, like this:
-
-
- ┌────────────────┐
- │ ∀(x: Bool) → x │
- └────────────────┘
- ⇧
- Using ❰λ❱ here instead of ❰∀❱ would transform this into a valid function