use default branches for unknown symbol kinds
          #132
        
          
      
                
     Merged
            
            
          
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Summary
This PR tweaks how swift-docc uses
KindIdentifierinstances from SymbolKit. Instead of matching on an explicit.unknowncase (and using an exhaustive match), it instead changes them todefaultbranches, to catch any new cases as they're added. This allows us to add new symbol kinds to SymbolKit (e.g. swiftlang/swift-docc-symbolkit#21) without creating a source-breaking change.Dependencies
N/A
Testing
Existing functionality should remain unchanged.
Checklist
Make sure you check off the following items. If they cannot be completed, provide a reason.
./bin/testscript and it succeeded