llvm dev - Aug 2020 - Matching Function Parameter to Corresponding Template Clang-Tidy Check

Hello,

I am working on some clang-tidy checks and am trying to figure out which
AST class functions can help identify from which template a generic
parameter comes from, eg
```
template <typename T>
class A {
   template <typename U>
   void func(T t) {}
};
```
where I want to know if the func parameter `T t` matches the function
template or the class template. (So in this case, it would match the class
template <typename T>

New to llvm-dev/clang so please let me know if I've missed some
mailing-list etiquette!

Best,
Yannan
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