From 60129b7d1c0ea8bdf2ec666fa51957e97465e88f Mon Sep 17 00:00:00 2001 From: Nadrieril Date: Mon, 6 May 2019 23:17:26 +0200 Subject: Consolidate errors in the error module --- dhall/src/errors/MissingHandler.txt | 32 -------------------------------- 1 file changed, 32 deletions(-) delete mode 100644 dhall/src/errors/MissingHandler.txt (limited to 'dhall/src/errors/MissingHandler.txt') diff --git a/dhall/src/errors/MissingHandler.txt b/dhall/src/errors/MissingHandler.txt deleted file mode 100644 index 433445e..0000000 --- a/dhall/src/errors/MissingHandler.txt +++ /dev/null @@ -1,32 +0,0 @@ -Explanation: You can ❰merge❱ the alternatives of a union using a record with one -handler per alternative, like this: - - - ┌─────────────────────────────────────────────────────────────────────┐ - │ let union = < Left = +2 | Right : Bool > │ - │ in let handlers = { Left = Natural/even, Right = λ(x : Bool) → x } │ - │ in merge handlers union : Bool │ - └─────────────────────────────────────────────────────────────────────┘ - - -... but you must provide exactly one handler per alternative in the union. You -cannot omit any handlers - -For example, the following expression is $_NOT valid: - - - Invalid: Missing ❰Right❱ handler - ⇩ - ┌─────────────────────────────────────────────────┐ - │ let handlers = { Left = Natural/even } │ - │ in let union = < Left = +2 | Right : Bool > │ - │ in merge handlers union : Bool │ - └─────────────────────────────────────────────────┘ - - -Note that you need to provide handlers for other alternatives even if those -alternatives are never used - -You need to supply the following handlers: - -↳ $txt0 -- cgit v1.2.3