shithub: mc

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The lhs of += should be an lval.

--- a/6/simp.c

+++ b/6/simp.c

@@ -1327,7 +1327,7 @@

         case Oaddeq: case Osubeq: case Omuleq: case Odiveq: case Omodeq:

         case Oboreq: case Obandeq: case Obxoreq: case Obsleq: case Obsreq:

             assert(fusedmap[exprop(n)] != Obad);

-            u = rval(s, args[0], NULL);

+            u = lval(s, args[0]);

             v = rval(s, args[1], NULL);

             v = mkexpr(n->loc, fusedmap[exprop(n)], u, v, NULL);

             v->expr.type = u->expr.type;