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author | Nadrieril | 2019-03-01 17:28:19 +0100 |
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committer | Nadrieril | 2019-03-01 17:28:19 +0100 |
commit | e5d9aee00b0c775df1d8e2d8819aeb80dffa73c2 (patch) | |
tree | e763a24a0d635048232e72e167ca37eafec69369 /dhall/src/errors/NotAFunction.txt | |
parent | 8a2b7536902831079eddd7b00291b718f5dd7186 (diff) |
Split abnf_to_pest and dhall into their own crates
Diffstat (limited to 'dhall/src/errors/NotAFunction.txt')
-rw-r--r-- | dhall/src/errors/NotAFunction.txt | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/dhall/src/errors/NotAFunction.txt b/dhall/src/errors/NotAFunction.txt new file mode 100644 index 0000000..dd2695d --- /dev/null +++ b/dhall/src/errors/NotAFunction.txt @@ -0,0 +1,68 @@ +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 |