compiler changes:

export.c:
		- only expose explicitly exported types to importer
		- fix behind your back
	go.h:
		- add deep() prototype (fixes 64-bit linux crash on time.go)
	go.y:
		- add a new syntax error case
	walk.c:
		- allow a,b = f() where f is func ptr (fixes bug088)

R=ken
OCL=15617
CL=15630

src/cmd/gc/export.c

@@ -143,7 +143,10 @@ dumpexporttype(Sym *s)
 		if(et < 0 || et >= nelem(types) || types[et] == T)
 			fatal("dumpexporttype: basic type: %S %E", s, et);
 		/* type 5 */
-		Bprint(bout, "\ttype %lS %d\n", s, et);
+		Bprint(bout, "\ttype ");
+		if(s->export != 0)
+			Bprint(bout, "!");
+		Bprint(bout, "%lS %d\n", s, et);
 		break;
 
 	case TARRAY:
@@ -298,11 +301,6 @@ renamepkg(Node *n)
 	if(n->psym == pkgimportname)
 		if(pkgmyname != S)
 			n->psym = pkgmyname;
-
-	if(n->psym->lexical != LPACK) {
-		warn("%S is becoming a package behind your back", n->psym);
-		n->psym->lexical = LPACK;
-	}
 }
 
 Sym*
@@ -425,16 +423,21 @@ importaddtyp(Node *ss, Type *t)
 	Sym *s;
 
 	s = getimportsym(ss);
-	if(s->otype == T) {
-		addtyp(newtype(s), t, PEXTERN);
-		return;
-	}
-	if(!eqtype(t, s->otype, 0)) {
+	if(ss->etype){	// exported
+		if(s->otype == T || !eqtype(t, s->otype, 0)) {
+			if(s->otype != T)
 				print("redeclaring %S %lT => %lT\n", s, s->otype, t);
 			addtyp(newtype(s), t, PEXTERN);
-		return;
+			/*
+			 * mark as export to avoid conflicting export bits
+			 * in multi-file package.
+			 */
+			s->export = 1;
+		}
+	}else{
+		s->otype = t;
+		t->sym = s;
 	}
-//	print("sametype %S %lT => %lT\n", s, s->otype, t);
 }
 
 /*

src/cmd/gc/go.h

@@ -729,3 +729,4 @@ void	dowidth(Type*);
 void	argspace(int32);
 Node*	nodarg(Type*, int);
 void	nodconst(Node*, Type*, vlong);
+Type*	deep(Type*);

src/cmd/gc/go.y

@@ -1693,7 +1693,12 @@ latype:
 	}
 |	LNAME
 	{
-		yyerror("%s is var, not type", $1->name);
+		yyerror("no type %s", $1->name);
+		YYERROR;
+	}
+|	lpack '.' LNAME
+	{
+		yyerror("no type %s.%s", context, $3->name);
 		YYERROR;
 	}
 

src/cmd/gc/walk.c

@@ -2691,6 +2691,8 @@ multi:
 	case OCALL:
 		walktype(nr->left, Erv);
 		t = nr->left->type;
+		if(t != T && t->etype == tptr)
+			t = t->type;
 		if(t == T || t->etype != TFUNC)
 			goto badt;
 		if(t->outtuple != cl)