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sim: K (konkat): index 0 is a valid variable index

--- a/sim.c

+++ b/sim.c

@@ -516,11 +516,9 @@

     Glyph var = PEEK(0, i + 1);

     if (var != '.') {

       Usz var_idx = index_of(var);

-      if (var_idx != 0) {

-        Glyph result = extra_params->vars_slots[var_idx];

-        PORT(1, i + 1, OUT);

-        POKE(1, i + 1, result);

-      }

+      Glyph result = extra_params->vars_slots[var_idx];

+      PORT(1, i + 1, OUT);

+      POKE(1, i + 1, result);

     }

   }

 END_OPERATOR