Update Expressions.pm6 to use rule instead of backtracking regex based on alternatives being atomic to backtracking to be documented and tested resulting from new perl6 doc issue #1962: https://github.com/perl6/doc/issues/1962
Update Expressions.pm6 to use rule instead of backtracking regex based on
alternatives being atomic to backtracking to be documented and tested
resulting from new perl6 doc issue #1962:
https://github.com/perl6/doc/issues/1962

albastev/Grammar-Modelica