C++ lexer doesn't recognize function if return type is templated

[Anteru]

(Original issue 1434 created by kaka345 on 2018-03-31T17:49:31.980596+00:00)

For this snippet the function name isn't highlighted because its return type is a template:

#!c++
std::vector<int> func()
{
  std::vector<int> v = {0};
  return v;
}

For this snippet the function name is highlighted because its return type is not a template:

#!c++
int func()
{
  return 0;
}

[Anteru]

Reproduced 2021-03-05

[bdaase]

Any template seems to be enough to reproduce this issue, it must not be on the return type.

template <float a>
int func()
{
  return 0;
}

This also reproduces the problem.