Swift 错误诊断教育性注释

使用要求带有 Self 或关联类型的协议
2020-03-02
诊断名称错误信息
unsupported_existential_type protocol X can only be used as a generic constraint because it has Self or associated type requirements

属性包装器的实现要求

2020-02-28

诊断名称	错误信息
`property_wrapper_no_value_property`	property wrapper type `X` does not contain a non-static property named `Y`
`property_wrapper_wrong_initial_value_init`	`X` parameter type (`Y`) must be the same as its `wrappedValue` property type `Z` or an `@autoclosure` thereof
`property_wrapper_failable_init`	property wrapper initializer `X` cannot be failable
`property_wrapper_type_requirement_not_accessible`	[`private`/`fileprivate`/`internal`/`public`/`open`] `XXX Y` cannot have more restrictive access than its enclosing property wrapper type `Z` (which is [`private`/`fileprivate`/`internal`/`public`/`open`])

@dynamicCallable 的实现要求

2020-01-13

诊断名称	错误信息
`invalid_dynamic_callable_type`	`@dynamicCallable` attribute requires `X` to have either a valid `dynamicallyCall(withArguments:)` method or `dynamicallyCall(withKeywordArguments:)` method
`missing_dynamic_callable_kwargs_method`	`@dynamicCallable` type `X` cannot be applied with keyword arguments; missing `dynamicCall(withKeywordArguments:)` method

闭包类型推断
2019-12-04
诊断名称错误信息
cannot_infer_closure_result_type unable to infer [complex] closure return type; add explicit type to disambiguate

名义类型（nominal type）

2019-11-02

诊断名称	错误信息
`non_nominal_no_initializers`	non-nominal type `X` does not support explicit initialization
`non_nominal_extension`	non-nominal type `X` cannot be extended
`associated_type_witness_conform_impossible`	candidate can not infer `X` = `Y` because `Y` is not a nominal type and so can’t conform to `Z`