Commits on Mar 27, 2022

1. [C++] Support requires-clause in more places …

   Previously a C++20 requires-clause was only supported on `function`
   declarations.  However, the C++ standard allows a require-clause on
   class/union templates, alias templates, and variable templates, and
   also allows a requires clause after each template parameter list, not
   just the final one.
   
   This moves the requiresClause to be a property of `ASTTemplateParams`
   rather than `ASTDeclaration` to better match the C++ grammar and
   allows requires clauses in many places that are supported by C++20 but
   were not previously allowed by Sphinx, namely:
   
   - On class templates, alias templates, and variable templates
   
   - After each template parameter list, not just the last one.
   
   - After the template parameter list in template template parameters.
   
   When encoding the id, the requires clause of the last template
   parameter list is treated specially in order to preserve compatibility
   with existing v4 ids.

   

   jbms committed Mar 27, 2022
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2. [C++] Allow trailing-requires-clause on functions without a template … …

   …prefix

   

   jbms committed Mar 27, 2022
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3. [C++] Allow trailing requires-clause on constructors

   

   jbms committed Mar 27, 2022
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4. [C++] Allow template prefix on union declarations

   

   jbms committed Mar 27, 2022
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