Document 87429 #156
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Document 87429 #156
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mknorps
suggested changes
Jun 13, 2022
| title: Illegal datatype context | ||
| summary: Constraints present in datatype declaration without DatatypeContexts. | ||
| severity: error | ||
| introduced: 9.6.1 |
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Please add extensions that have to accompany this error.
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So by default, no extensions are needed to get the error. There is a possible extension to fix the error, but because it's deprecated I have not been using said error.
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I've removed the unnecessary NoDatatypeContexts pragma.
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| Without the language extension `DatatypeContexts` enabled, it is illegal to add constraints to the context of a datatype definition. Whilst this can be solved with enabling `DatatypeContexts`, *however* this extension is deprecated and is considered a misfeature. Other solutions to fix this can include: | ||
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| - Placing constraints on the *use-site* of a datatype, or |
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Could you add example of such "after" fix?
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Added a second example.
david-christiansen
approved these changes
Jun 13, 2022
akrmn
reviewed
Jun 13, 2022
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@mknorps are you satisfied with the updates? |
mknorps
approved these changes
Jun 14, 2022
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