Sema: Improve diagnostics for overrides of unavailable decls #65456
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Unavailable decls cannot be overridden by available decls. This change improves the compiler diagnostics for this restriction in a few ways: - Duplicate diagnostics are suppressed for getters and setters inside property declarations that have already been diagnosed. - Diagnostics are suppressed for implicit accessors since they would typically duplicate diagnostics for the explicit accessors the implicit ones are derived from. - Decls inside unavailable a derived class are no longer incorrectly diagnosed.
tshortli
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AnthonyLatsis,
hborla,
slavapestov and
xedin
as code owners
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@swift-ci please test |
Comment on lines
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| auto unavailabilityStatusAndAttr = | ||
| checkOverrideUnavailability(override, base); | ||
| auto *unavailableAttr = unavailabilityStatusAndAttr.second; |
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Nit: If we are in c++ 17 maybe we could use structured binding here =]
Suggested change
| auto unavailabilityStatusAndAttr = | |
| checkOverrideUnavailability(override, base); | |
| auto *unavailableAttr = unavailabilityStatusAndAttr.second; | |
| auto [status, unavailableAttr] = | |
| checkOverrideUnavailability(override, base); |
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That does seem nicer. I'm not going to revise this solely for that right now but I'll keep an eye out for opportunities to improve readability with this syntax in the future now that the project uses C++17.
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Unavailable decls cannot be overridden by available decls. This change improves the compiler diagnostics for this restriction in a few ways: