Broken highlighting for macros

[glyh]

Here's the code

#define _vm_binop(op, wrap)\
    {\
        Janet op1 = stack[B];\
        Janet op2 = stack[C];\
        if (janet_checktype(op1, JANET_NUMBER) && janet_checktype(op2, JANET_NUMBER)) {\
            double x1 = janet_unwrap_number(op1);\
            double x2 = janet_unwrap_number(op2);\
            stack[A] = wrap(x1 op x2);\
            vm_pcnext();\
        } else {\
            vm_commit();\
            stack[A] = janet_binop_call(#op, "r" #op, op1, op2);\
            vm_checkgc_pcnext();\
        }\
    }

And the highlighting outcome on neovim:

Something is wrong after line 168.

[ObserverOfTime]

The parser doesn't support stringizing (#foo) and concatenation (foo##bar).