[cfe-dev] [AST] how to check if a type is template specification type and get the template paramter?

[Yafei Liu via cfe-dev]

Hi, all.

I want to check if a given `clang::Type` is a std::vector<xxx> and get the
type of xxx.

I tried this `if (const auto *tst =
llvm::dyn_cast<clang::TemplateSpecializationType>(type)) {}` but the
condition is always false, it seems that TemplateSpecializationType is not
what I think it is.

So can what I want be done?
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