c-tree.texi (ARRAY_REF): Say what type of expression must be.

	* doc/c-tree.texi (ARRAY_REF): Say what type of expression must be.
	(ARRAY_RANGE_REF): Added description.

From-SVN: r42855

gcc/ChangeLog

@@ -29,6 +29,9 @@ Mon Jun  4 16:50:33 CEST 2001  Jan Hubicka  <jh@suse.cz>
 
 Mon Jun  4 09:21:19 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
+	* doc/c-tree.texi (ARRAY_REF): Say what type of expression must be.
+	(ARRAY_RANGE_REF): Added description.
+
 	* tree.def (ARRAY_RANGE_REF): New code.
 	* alias.c (handled_component_p, can_address_p): Handle it.
 	* dwarf2out.c (loc_descriptor_from_tree): Likewise.

gcc/doc/c-tree.texi

@@ -2017,7 +2017,15 @@ always @code{a - a/b} where the division is as if computed by a
 These nodes represent array accesses.  The first operand is the array;
 the second is the index.  To calculate the address of the memory
 accessed, you must scale the index by the size of the type of the array
-elements.
+elements.  The type of these expressions must be the type of a component of
+the array.
+
+@item ARRAY_RANGE_REF
+These nodes represent access to a range (or ``slice'') of an array.  The
+operands are the same as that for @code{ARRAY_REF} and have the same
+meanings.  The type of these expressions must be an array whose component
+type is the same as that of the first operand.  The range of that array
+type determines the amount of data these expressions access.
 
 @item EXACT_DIV_EXPR
 Document.