clarify pointer forward decls per ian's suggestion

R=r
DELTA=13  (3 added, 7 deleted, 3 changed)
OCL=14406
CL=14406

doc/go_lang.txt

@@ -786,6 +786,7 @@ particular to dereference a channel pointer.
 	var ch *chan int;
 	ch = new(chan int);  // new returns type *chan int
 
+
 Function types
 ----
 
@@ -990,11 +991,13 @@ The following scope rules apply:
 	1. No identifier may be declared twice in a single scope.
 	2. A language entity may only be referred to within its scope.
 	3. Field and method identifiers may be used only to select elements
-	   from the corresponding types.  In effect, the field selector operator 
+	   from the corresponding types, and only after those types are fully
+	   declared.  In effect, the field selector operator
 	   '.' temporarily re-opens the scope of such identifiers (see Expressions).
 	4. Forward declaration: A type of the form "*T" may be mentioned at a point
-	   where "T" is not yet declared. The declaration of "T" must follow in the
-	   same package and "T" must be visible at the end of the block containing "*T".
+	   where "T" is not yet declared. The full declaration of "T" must be within a
+	   block containing the forward declaration, and the forward declaration
+	   refers to the innermost such full declaration.
 
 Global declarations optionally may be marked for export with the reserved word
 "export". Local declarations can never be exported.
@@ -1016,10 +1019,6 @@ TODO: Eventually we need to be able to restrict visibility of fields and methods
 Export should be identifier-based: an identifier is either exported or not, and thus
 visible or not in importing package.
 
-[OLD
-	Declaration = ConstDecl | TypeDecl | VarDecl | FunctionDecl | ExportDecl .
-END]
-
 
 Const declarations
 ----
@@ -1738,9 +1737,6 @@ if omitted, the first two examples above can be abbreviated:
 	)
 
 
-TODO: should iota work in var, type, func decls too?
-
-
 Statements
 ----