move block_comment_nesting_level to lexical_feedback_class * lex.h, lex.ll (block_comment_nesting_level): Move global variable to lexical_feedback class. Change all uses. (reset_parser): Don't reset block_comment_nesting_level.

# scope3.m
function scope3
  C;
  function A
    B;
    function B
      E;
    endfunction
    function E
    endfunction
  endfunction

  function C
    D;
    function D
      A;
    endfunction
  endfunction
endfunction