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Diffstat (limited to 'dhall/src/error/text/HandlerOutputTypeMismatch.txt')
| -rw-r--r-- | dhall/src/error/text/HandlerOutputTypeMismatch.txt | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/dhall/src/error/text/HandlerOutputTypeMismatch.txt b/dhall/src/error/text/HandlerOutputTypeMismatch.txt deleted file mode 100644 index f359459..0000000 --- a/dhall/src/error/text/HandlerOutputTypeMismatch.txt +++ /dev/null @@ -1,51 +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 │ - └─────────────────────────────────────────────────────────────────────┘ - - -... 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 |