bug#10590: c++-mode closing nested template angle braces breaks font-lock, indentation and show-paren-mode.

[Matt Renaud]

Emacs Version: 24.0.92.2

When writing C++ code with nested templates, putting two (or more) closing angle braces together causes the font-lock, show-paren-mode and indentation to break.  Positioning point on any of the closing parentheses fails to show the matching opening brace which makes template meta-programs difficult to read.  Any nested templates will cause this.  The following is a simple example showing the 2 cases:


template <typename T = std::vector<int>>
  struct foo    // Indentation broken here...
  {
  };


int main()
{
  std::vector<std::vector<int>> vv_int; // Font-lock broken here...

  return 0;
}