C++, fix non-type template parameter parsing

[jakobandersen]

Feature or Bugfix

• Bugfix

Detail

See #7944 (comment)

Relates

Fixes #7944

[fetzerch]

This seemed to introduce an issue with template template parameters if they don't appear as first argument:

A template declaration such as:

template<typename T, template<typename> typename U> A

now triggers the following warning:

WARNING: Error in template parameter list.
If parameter:
  Error when parsing template parameter.
  If unconstrained type parameter or template type parameter:
    Invalid C++ declaration: Expected 'typename' or 'class' in tbe beginning of template type parameter. [error at 21]
      template<typename T, template<typename> typename U> A
      ---------------------^
  If constrained type parameter or non-type parameter:
    Invalid C++ declaration: Expected identifier in nested name, got keyword: template [error at 29]
      template<typename T, template<typename> typename U> A
      -----------------------------^
If no parameter:
  Invalid C++ declaration: Expected "," or ">". [error at 21]
    template<typename T, template<typename> typename U> A
    ---------------------^

[jakobandersen]

@fetzerch, thanks! Turns out it didn't parse the space in front of template until after it tried to parse template it self, but it should be fixed in the next version (#8078).

[fetzerch]

@jakobandersen Cheers, just confirming that 3.2.1 solved the template template argument parsing.