bogus diagnostic with

default as first case
in a switch

SVN=123398

src/cmd/6g/gen.c

@@ -440,7 +440,7 @@ swgen(Node *n)
 	while(c1 != N) {
 		dynlineno = c1->lineno;	// for diagnostics
 		if(c1->op != OCASE) {
-			if(s0 == C)
+			if(s0 == C && dflt == P)
 				yyerror("unreachable statements in a switch");
 			gen(c1);
 
@@ -463,7 +463,6 @@ swgen(Node *n)
 			dflt = pc;
 
 		while(c2 != N) {
-
 			s = mal(sizeof(*s));
 			if(s0 == C)
 				s0 = s;

src/cmd/gc/walk.c

@@ -116,6 +116,7 @@ loop:
 		walktype(n->ninit, Etop);
 		walktype(n->ntest, Erv);
 		walktype(n->nbody, Etop);
+
 		// find common type
 		if(n->ntest->type == T)
 			n->ntest->type = walkswitch(n, sw1);
@@ -127,11 +128,9 @@ loop:
 		// set the type on all literals
 		if(n->ntest->type != T)
 			walkswitch(n, sw3);
-
-		walktype(n->ntest, Erv);
-
-		n = n->nincr;
-		goto loop;
+		walktype(n->ntest, Erv);	// BOTCH is this right
+		walktype(n->nincr, Erv);
+		goto ret;
 
 	case OEMPTY:
 		if(top != Etop)