gc: ... T corner cases

more to come, but should suffice for Printf work.

R=ken2
CC=golang-dev
https://golang.org/cl/197044

src/cmd/gc/closure.c

@@ -11,7 +11,7 @@
 void
 closurehdr(Node *ntype)
 {
-	Node *n, *name;
+	Node *n, *name, *a;
 	NodeList *l;
 
 	n = nod(OCLOSURE, N, N);
@@ -33,7 +33,11 @@ closurehdr(Node *ntype)
 		name = l->n->left;
 		if(name)
 			name = newname(name->sym);
-		ntype->list = list(ntype->list, nod(ODCLFIELD, name, l->n->right));
+		a = nod(ODCLFIELD, name, l->n->right);
+		a->isddd = l->n->isddd;
+		if(name)
+			name->isddd = a->isddd;
+		ntype->list = list(ntype->list, a);
 	}
 	for(l=n->rlist; l; l=l->next) {
 		name = l->n->left;

src/cmd/gc/dcl.c

@@ -501,6 +501,7 @@ oldname(Sym *s)
 			c = nod(ONAME, N, N);
 			c->sym = s;
 			c->class = PPARAMREF;
+			c->isddd = n->isddd;
 			c->defn = n;
 			c->addable = 0;
 			c->ullman = 2;

src/cmd/gc/reflect.c

@@ -115,6 +115,7 @@ methodfunc(Type *f, int use_receiver)
 	for(t=getinargx(f)->type; t; t=t->down) {
 		d = nod(ODCLFIELD, N, N);
 		d->type = t->type;
+		d->isddd = t->isddd;
 		in = list(in, d);
 	}
 

src/cmd/gc/subr.c

@@ -1004,6 +1004,9 @@ Jconv(Fmt *fp)
 	if(n->dodata != 0)
 		fmtprint(fp, " dd(%d)", n->dodata);
 
+	if(n->isddd != 0)
+		fmtprint(fp, " isddd(%d)", n->isddd);
+
 	return 0;
 }
 
@@ -2586,6 +2589,9 @@ adddot(Node *n)
 	if(t == T)
 		goto ret;
 	
+	if(n->left->op == OTYPE)
+		goto ret;
+
 	if(n->right->op != ONAME)
 		goto ret;
 	s = n->right->sym;
@@ -2783,6 +2789,9 @@ structargs(Type **tl, int mustname)
 			n = newname(lookup(buf));
 		}
 		a = nod(ODCLFIELD, n, typenod(t->type));
+		a->isddd = t->isddd;
+		if(n != N)
+			n->isddd = t->isddd;
 		args = list(args, a);
 	}
 	return args;

src/cmd/gc/typecheck.c

@@ -470,7 +470,7 @@ reswitch:
 		}
 		if(l->op == OTYPE) {
 			if(n->type->etype != TFUNC || n->type->thistuple != 1) {
-				yyerror("type %T has no method %s", n->left->type, sym);
+				yyerror("type %T has no method %hS", n->left->type, sym);
 				n->type = T;
 				goto error;
 			}
@@ -1527,7 +1527,7 @@ typecheckaste(int op, Type *tstruct, NodeList *nl, char *desc)
 				// TODO(rsc): drop first if in DDD cleanup
 				if(t->etype != TINTER)
 				if(checkconv(nl->n->type, t->type, 0, &xx, &yy, desc) < 0)
-					yyerror("cannot use %#N as type %T in %s", nl->n, t->type, desc);					
+					yyerror("cannot use %+N as type %T in %s", nl->n, t->type, desc);					
 			}
 			goto out;
 		}

test/ddd.go

@@ -14,6 +14,18 @@ func sum(args ...int) int {
 	return s
 }
 
+func sumC(args ...int) int {
+	return func() int { return sum(args) } ()
+}
+
+/* TODO(rsc)
+var sumD = func(args ...int) int { return sum(args) }
+
+var sumE = func() func(...int) int { return func(args ...int) int { return sum(args) } } ()
+
+var sumF = func(args ...int) func() int { return func() int { return sum(args) } }
+*/
+
 func sumA(args []int) int {
 	s := 0
 	for _, v := range args {
@@ -40,6 +52,14 @@ func ln(args ...T) int { return len(args) }
 
 func ln2(args ...T) int { return 2 * ln(args) }
 
+func (*T) Sum(args ...int) int {
+	return sum(args)
+}
+
+type U struct {
+	*T
+}
+
 func main() {
 	if x := sum(1, 2, 3); x != 6 {
 		panicln("sum 6", x)
@@ -53,6 +73,20 @@ func main() {
 	if x := sum(1, 8); x != 9 {
 		panicln("sum 9", x)
 	}
+	if x := sumC(4, 5, 6); x != 15 {
+		panicln("sumC 15", x)
+	}
+/* TODO(rsc)
+	if x := sumD(4, 5, 7); x != 16 {
+		panicln("sumD 16", x)
+	}
+	if x := sumE(4, 5, 8); x != 17 {
+		panicln("sumE 17", x)
+	}
+	if x := sumF(4, 5, 9)(); x != 18 {
+		panicln("sumF 18", x)
+	}
+*/
 	if x := sum2(1, 2, 3); x != 2*6 {
 		panicln("sum 6", x)
 	}
@@ -102,4 +136,36 @@ func main() {
 	if x := ln2([]T{}); x != 2*1 {
 		panicln("ln2 1", x)
 	}
+	if x := ((*T)(nil)).Sum(1,3,5,7); x != 16 {
+		panicln("(*T)(nil).Sum", x)
+	}
+	if x := (*T).Sum(nil, 1, 3, 5, 6); x != 15 {
+		panicln("(*T).Sum", x)
+	}
+	if x := (&U{}).Sum(1,3,5,5); x != 14 {
+		panicln("(&U{}).Sum", x)
+	}
+	var u U
+	if x := u.Sum(1,3,5,4); x != 13 {
+		panicln("u.Sum", x)
+	}
+	if x := (&u).Sum(1,3,5,3); x != 12 {
+		panicln("(&u).Sum", x)
+	}
+	var i interface { Sum(...int) int } = &u
+	if x := i.Sum(2,3,5,7); x != 17 {
+		panicln("i(=&u).Sum", x)
+	}
+	i = u
+	if x := i.Sum(2,3,5,6); x != 16 {
+		panicln("i(=u).Sum", x)
+	}
+/* TODO(rsc): Enable once nested method expressions work.
+	if x := (*U).Sum(&U{}, 1, 3, 5, 2); x != 11 {
+		panicln("(*U).Sum", x)
+	}
+	if x := U.Sum(U{}, 1, 3, 5, 1); x != 10 {
+		panicln("U.Sum", x)
+	}
+*/
 }

test/ddd1.go

@@ -14,7 +14,7 @@ var (
 	_ = sum(1.0, 2.0)
 	_ = sum(1.5)      // ERROR "integer"
 	_ = sum("hello")  // ERROR "convert"
-	_ = sum([]int{1}) // ERROR "slice literal as type int"
+	_ = sum([]int{1}) // ERROR "slice literal.*as type int"
 )
 
 type T []T