From 5c00b978b0bc0c1eeb64682cba6aa338fea320bf Mon Sep 17 00:00:00 2001
From: NanoTech
Date: Sun, 11 Dec 2016 23:27:36 -0600
Subject: Start implementing error explanations

---
 src/errors/NoDependentTypes.txt | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 src/errors/NoDependentTypes.txt

(limited to 'src/errors/NoDependentTypes.txt')

diff --git a/src/errors/NoDependentTypes.txt b/src/errors/NoDependentTypes.txt
new file mode 100644
index 0000000..435bdcb
--- /dev/null
+++ b/src/errors/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
-- 
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