[ConstraintSystem] Add a new locator element - argument attribute
#31867
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`ArgumentAttribute` points to a particular attribute associated with one of the arguments e.g. `inout` or its type e.g. `@escaping`. This is very useful when dealing with argument-to-parameter failures because it allows to express in the locator kind of a problem.
… handle `ArgumentAttribute` - `getCalleeLocator`, if given locator ends at `ArgumentAttribute` strip the last element which makes sure that produced locator always refers directly to argument-to-parameter conversion. - `simplifyLocator`, always leave `ArgumentAttribute` in the path because it's useful for diagnostics.
If either `MarkExplicitlyEscaping` or `TreatRValueAsLValue` fix points to an argument-to-parameter conversion, let's add more more clarifying argument to the locator to pinpoint the problem.
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hborla
approved these changes
May 19, 2020
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ArgumentAttributepoints to a particular attribute associatedwith one of the arguments e.g.
inoutor its type e.g.@escaping.This is very useful when dealing with argument-to-parameter
failures because it allows to express in the locator kind
of a problem.
ArgumentAttributeelement is useful for new approach to ambiguity diagnostics(#31713) because it makes it possible
to unambiguously point out that a certain failures are associated with an
argument to a call instead of a call itself.