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author | Nadrieril | 2019-03-01 17:28:19 +0100 |
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committer | Nadrieril | 2019-03-01 17:28:19 +0100 |
commit | e5d9aee00b0c775df1d8e2d8819aeb80dffa73c2 (patch) | |
tree | e763a24a0d635048232e72e167ca37eafec69369 /dhall/src/errors/InvalidOptionalLiteral.txt | |
parent | 8a2b7536902831079eddd7b00291b718f5dd7186 (diff) |
Split abnf_to_pest and dhall into their own crates
Diffstat (limited to 'dhall/src/errors/InvalidOptionalLiteral.txt')
-rw-r--r-- | dhall/src/errors/InvalidOptionalLiteral.txt | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/dhall/src/errors/InvalidOptionalLiteral.txt b/dhall/src/errors/InvalidOptionalLiteral.txt new file mode 100644 index 0000000..41c0fdc --- /dev/null +++ b/dhall/src/errors/InvalidOptionalLiteral.txt @@ -0,0 +1,53 @@ +Explanation: The syntax for ❰Optional❱ values resembles the syntax for ❰List❱s: + + + ┌───────────────────────┐ + │ [] : Optional Integer │ An ❰Optional❱ value which is absent + └───────────────────────┘ + + + ┌───────────────────────┐ + │ [] : List Integer │ An empty (0-element) ❰List❱ + └───────────────────────┘ + + + ┌────────────────────────┐ + │ [1] : Optional Integer │ An ❰Optional❱ value which is present + └────────────────────────┘ + + + ┌────────────────────────┐ + │ [1] : List Integer │ A singleton (1-element) ❰List❱ + └────────────────────────┘ + + +However, an ❰Optional❱ value can $_NOT have more than one element, whereas a +❰List❱ can have multiple elements: + + + ┌───────────────────────────┐ + │ [1, 2] : Optional Integer │ Invalid: multiple elements $_NOT allowed + └───────────────────────────┘ + + + ┌───────────────────────────┐ + │ [1, 2] : List Integer │ Valid: multiple elements allowed + └───────────────────────────┘ + + +Your ❰Optional❱ value had this many elements: + +↳ $txt0 + +... when an ❰Optional❱ value can only have at most one element + +Some common reasons why you might get this error: + +● You accidentally typed ❰Optional❱ when you meant ❰List❱, like this: + + + ┌────────────────────────────────────────────────────┐ + │ List/length Integer ([1, 2, 3] : Optional Integer) │ + └────────────────────────────────────────────────────┘ + ⇧ + This should be ❰List❱ instead |