Update non_exhaustive to use the attribute template
#1921
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This adds a rule name that was missing for this statement. It also clarifies why this is being said.
This statement isn't really a rule, but more of a high-level explanation. I have moved it to the intro where I think it better belongs.
Some word cleanup and a hidden clarification.
The original felt a little awkward with how it differentiated between enum and enum variants. I also wasn't terribly happy with using a list here.
This adds a missing rule for this paragraph. It also adds a little more clarity as to what it means.
The existing rule was mixing pattern match restrictions with match arm exhaustiveness. Although very closely related, I think they deserve to be split up. This also adds a little clarity about tuple matching.
`type` is a keyword and can't be used here.
Single-segment identifiers are bindings and don't work to match against a Unit struct.
The intent here is to highlight exactly where the errors are in the example (and which ones aren't errors!).
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New rules:
attributes.type-system.non_exhaustive.duplicatesattributes.type-system.non_exhaustive.enum-exhaustivenessattributes.type-system.non_exhaustive.enum-castattributes.type-system.non_exhaustive.inhabitedRenamed rules:
attributes.type-system.non_exhaustive.external-cratemoved to.introbecause it is generally explaining the purpose.