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authorNadrieril2019-03-01 17:28:19 +0100
committerNadrieril2019-03-01 17:28:19 +0100
commite5d9aee00b0c775df1d8e2d8819aeb80dffa73c2 (patch)
treee763a24a0d635048232e72e167ca37eafec69369 /src/errors/HandlerOutputTypeMismatch.txt
parent8a2b7536902831079eddd7b00291b718f5dd7186 (diff)
Split abnf_to_pest and dhall into their own crates
Diffstat (limited to 'src/errors/HandlerOutputTypeMismatch.txt')
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1 files changed, 0 insertions, 51 deletions
diff --git a/src/errors/HandlerOutputTypeMismatch.txt b/src/errors/HandlerOutputTypeMismatch.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 │
- └─────────────────────────────────────────────────────────────────────┘
-
-
-... as long as the output type of each handler function matches the declared type
-of the result:
-
-
- ┌───────────────────────────────────────────────────────────┐
- │ handlers : { Left : Natural → Bool, Right : Bool → Bool } │
- └───────────────────────────────────────────────────────────┘
- ⇧ ⇧
- These output types ...
-
- ... must match the declared type of the ❰merge❱
- ⇩
- ┌─────────────────────────────┐
- │ merge handlers union : Bool │
- └─────────────────────────────┘
-
-
-For example, the following expression is $_NOT valid:
-
-
- ┌──────────────────────────────────────────────────────────────────────┐
- │ let union = < Left = +2 | Right : Bool > │
- │ in let handlers = { Left = Natural/even, Right = λ(x : Bool) → x } │
- │ in merge handlers union : Text │
- └──────────────────────────────────────────────────────────────────────┘
- ⇧
- Invalid: Doesn't match output of either handler
-
-
-Your handler for the following alternative:
-
-↳ $txt0
-
-... needs to return an output value of type:
-
-↳ $txt1
-
-... but actually returns an output value of a different type:
-
-↳ $txt2