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author | Nadrieril | 2019-05-06 23:17:26 +0200 |
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committer | Nadrieril | 2019-05-06 23:20:47 +0200 |
commit | 60129b7d1c0ea8bdf2ec666fa51957e97465e88f (patch) | |
tree | 2118155537989a1a3bfa6c51b5c476651a0ef93e /dhall/src/errors/UnusedHandler.txt | |
parent | 423fdeebe9247b16744fae4b50df415bbd08be04 (diff) |
Consolidate errors in the error module
Diffstat (limited to 'dhall/src/errors/UnusedHandler.txt')
-rw-r--r-- | dhall/src/errors/UnusedHandler.txt | 32 |
1 files changed, 0 insertions, 32 deletions
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❱ |