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author | Nadrieril | 2019-05-06 23:17:26 +0200 |
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committer | Nadrieril | 2019-05-06 23:20:47 +0200 |
commit | 60129b7d1c0ea8bdf2ec666fa51957e97465e88f (patch) | |
tree | 2118155537989a1a3bfa6c51b5c476651a0ef93e /dhall/src/error/text/NoDependentTypes.txt | |
parent | 423fdeebe9247b16744fae4b50df415bbd08be04 (diff) |
Consolidate errors in the error module
Diffstat (limited to 'dhall/src/error/text/NoDependentTypes.txt')
-rw-r--r-- | dhall/src/error/text/NoDependentTypes.txt | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/dhall/src/error/text/NoDependentTypes.txt b/dhall/src/error/text/NoDependentTypes.txt new file mode 100644 index 0000000..435bdcb --- /dev/null +++ b/dhall/src/error/text/NoDependentTypes.txt @@ -0,0 +1,31 @@ +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 |