GCC does the same thing to this day. As a result, the GCC AST hasn't much S in it, except for some OpenMP constructs (which are preserved in the AST). It's not

GCC does the same thing to this day. As a result, the GCC AST hasn't much S in it, except for some OpenMP constructs (which are preserved in the AST). It's not great if you want to write syntax-driven tools.