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authorNadrieril2019-05-07 18:12:04 +0200
committerNadrieril2019-05-07 18:12:04 +0200
commit3da450aa3fae23214aa982643b9bc4dd0ea4eaa6 (patch)
tree02e00cd008d2e7dc899b9211379596fe792f41c8 /dhall/src/error/text/NoDependentTypes.txt
parentd8a3e831fb67f86269c4baa99f9f0798a73a7247 (diff)
parent14dfeb8e7d2aa87a361a711a485243449426b144 (diff)
Merge branch 'reorganize'
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+Explanation: The Dhall programming language does not allow functions from terms
+to types. These function types are also known as "dependent function types"
+because you have a type whose value "depends" on the value of a term.
+
+For example, this is $_NOT a legal function type:
+
+
+ ┌─────────────┐
+ │ Bool → Type │
+ └─────────────┘
+
+
+Similarly, this is $_NOT legal code:
+
+
+ ┌────────────────────────────────────────────────────┐
+ │ λ(Vector : Natural → Type → Type) → Vector +0 Text │
+ └────────────────────────────────────────────────────┘
+ ⇧
+ Invalid dependent type
+
+
+Your function type is invalid because the input has type:
+
+↳ $txt0
+
+... and the output has kind:
+
+↳ $txt1
+
+... which makes this a forbidden dependent function type