[operators] let and temp

lib/operators.pod

@@ -481,4 +481,22 @@ details.
 Creates a I<one> L<Junction> from its arguments. See L<Junction> for more
 details.
 
+=head1 Named Unary Precedence
+
+=head2 prefix temp
+
+    sub prefix:<temp>(Mu $a is rw)
+
+"temporizes" the variable passed as the argument, which means it is reset
+to its old value on scope exit. (This is similar to the
+L<local|http://perldoc.perl.org/functions/local.html> operator in Perl 5,
+except that C<temp> does not reset the value).
+
+=head2 prefix let
+
+    sub prefix:<let>(Mu $a is rw)
+
+Hypothetical reset: if the current scope is exited either through an exception
+or C<fail()>, the old value is restored.
+
 =end pod