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authorNadrieril2019-03-01 17:28:19 +0100
committerNadrieril2019-03-01 17:28:19 +0100
commite5d9aee00b0c775df1d8e2d8819aeb80dffa73c2 (patch)
treee763a24a0d635048232e72e167ca37eafec69369 /src/errors/UnusedHandler.txt
parent8a2b7536902831079eddd7b00291b718f5dd7186 (diff)
Split abnf_to_pest and dhall into their own crates
Diffstat (limited to 'src/errors/UnusedHandler.txt')
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diff --git a/src/errors/UnusedHandler.txt b/src/errors/UnusedHandler.txt
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-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❱