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9c: copy warning from other compilers regarding pointer -> int truncation

--- a/sys/src/cmd/9c/cgen.c

+++ b/sys/src/cmd/9c/cgen.c

@@ -476,6 +476,10 @@

 			cgen(l, nn);

 			break;

 		}

+		if(ewidth[n->type->etype] < ewidth[l->type->etype]){

+			if(l->type->etype == TIND && typechlp[n->type->etype])

+				warn(n, "conversion of pointer to shorter integer");

+		}

 		regalloc(&nod, l, nn);

 		cgen(l, &nod);

 		regalloc(&nod1, n, &nod);