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Dana Jansens
ca3f95faa6
This requires declared FacetTypes to hold NamedConstraintIds (along with a specific) that are named in an extend or impls requirement. We add support to stringify and formatter to display the named constraints in the facet type, and special case when a facet type contains a single extend named constraint, like we did for a single extend interface. This means that `RequireIndentifiedFacetType` can now fail, if the facet type contains a forward-declared named constraint. Add the appropriate diagnostics for each call to this function, and note the ones that should change to `RequireCompleteFacetType` in the future with TODOs. We also add tests for using facet types that can or can't be identified, or completed, with named constraints in them.