Add := and ::=. xenoterracide++ benabik++ lizmat++

Author: Mouq

lib/Language/operators.pod

@@ -1166,14 +1166,42 @@ well, so the are also checked against the endpoint:
 
 =head1 List Prefix Precedence
 
-=head2 =
+=head2 infix =
 
 List assignment. Its exact semantics are left to the container type on the
 left-hand side. See L<Array> and L<Hash> for common cases.
 
 The distinction between item assignment and list assignment is determined by
 the parser depending on the syntax of the left-hand side.
 
+=head2 infix :=
+
+Binding. Whereas C<$x = $y> puts the value in C<$y> into C<$x>, C<$x :=
+$y> makes C<$x> and C<$y> the same thing.
+
+    for code :allow<B L>
+    my $a = 42;
+    my $b B<=> $a;
+    $bL<++>;
+    say $a;
+
+This will output 42, because C<$a> and C<$b> both contained the number
+C<42>, but the L<containers|/language/containters.html#Binding> were
+different.
+
+    for code :allow<B L>
+    my $a = 42;
+    my $b B<:=> $a;
+    $bL<++>;
+    say $a;
+
+This will output 43, since C<$b> and C<$a> both represented the same
+object.
+
+=head2 infix ::=
+
+Read-only binding. See L<C<infix :=>|:=>.
+
 =head2 listop ...
 
 The I<yada, yada, yada> operator or I<stub> operator. If it is the only