[cfe-dev] [GSoC] Provide information for the type as written in template instantiations

[Jan Svoboda via cfe-dev]

Hi,
my name is Jan Svoboda and I'd like to participate in this year's GSoC.

In particular, I'm interested in improving template-related error messages
by using sugared (as-written) representation of template type arguments:
https://llvm.org/OpenProjects.html#clang-template-instantiation-sugar.

I've been looking through the source code and I have two questions regarding
the proposed design approach:

1. "... whenever a member of a class template specialization is accessed."
   How can I detect this kind of member access? In the first example with
   `vector<string>`, is it as simple as checking the result of
   `FunctionDecl::isTemplateInstantiation`? I think this check could be
   done in `FunctionDecl::getReturnType` when deducing types in the
   assignment.

2. "... add a new type node to represent template argument sugar,"
   How can I fetch the template argument sugar? I believe it's already being
   stored in `clang::TemplateArgument`, but haven't found and obvious way
   how to get it from `FunctionDecl::getReturnType`.

Any thoughts appreciated.

Thanks,
Jan
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