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/UnusedHandler.txt | 32 -------------------------------- 1 file changed, 32 deletions(-) delete mode 100644 dhall/src/errors/UnusedHandler.txt (limited to 'dhall/src/errors/UnusedHandler.txt') diff --git a/dhall/src/errors/UnusedHandler.txt b/dhall/src/errors/UnusedHandler.txt deleted file mode 100644 index 2e46a12..0000000 --- a/dhall/src/errors/UnusedHandler.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 supply extra handlers - -For example, the following expression is $_NOT valid: - - - ┌───────────────────────────────────────┐ - │ let union = < Left = +2 > │ The ❰Right❱ alternative is missing - │ in let handlers = │ - │ { Left = Natural/even │ - │ , Right = λ(x : Bool) → x │ Invalid: ❰Right❱ handler isn't used - │ } │ - │ in merge handlers union : Bool │ - └───────────────────────────────────────┘ - - -You provided the following handlers: - -↳ $txt0 - -... which had no matching alternatives in the union you tried to ❰merge❱ -- cgit v1.2.3