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+NAME
+        block
+
+DESCRIPTION
+        A block is a special statment, that begins with '{', contains
+        a list of statements, and ends with '}'.
+
+        The block may define local variables. If for a variable no
+        initialisation is given, the variable is initialised to 0 every
+        time the block is entered. Otherwise, the initialisation
+        expression is evaluated and its result assigned to the variable
+        everytime the block is entered.
+
+        Example definitions are:
+
+          int i;
+          int j = 3;
+          int k = 3 * j, l;
+
+          Here, i and l are both initialised to 0; j is initialised
+          to 3, and k is initialised to 9 (3 * j).
+
+        Local variables defined in a block are visible only until the
+        end of the block. Definitions in an inner block hide definitions in
+        outer blocks.
+
+HISTORY
+        Up to 3.2.7 local variables were visible (from their point of
+        definition) in the whole function. That is, code like
+
+            do {
+                int res;
+
+                res = ...
+            } while (res == 5);
+            write(res);
+
+        was perfectly legal. It is no longer, as 'res' ceases to exist
+        with the closing '}' of the while().
+
+        Up to 3.5.0 you could get this old behaviour back with the 
+        #pragma no_local_scopes and switch it off again with 
+        #pragma local_scopes.
+
+        Since 3.5.0 it is not possible to disable the local scope behaviour.
+
+        Up to 3.2.8, local variables could not be initialised in their
+        definition.