diff --git a/src/classes/IO.pir b/src/classes/IO.pir
index d0120479da7..0182f8992f5 100644
--- a/src/classes/IO.pir
+++ b/src/classes/IO.pir
@@ -41,6 +41,23 @@ Reads a line from the file handle.
 .end
 
 
+=back
+
+=head2 Functions
+
+=over 4
+
+=item C<prefix:=(IO $io)>
+
+Gets the iterator for the IO object.
+
+=cut
+
+.namespace []
+.sub 'prefix:=' :multi('IO')
+    'die'("prefix:<=> has been superseeded by $handle.lines and $handle.get")
+.end
+
 =back
 
 =head1 IOIterator
diff --git a/src/parser/grammar-oper.pg b/src/parser/grammar-oper.pg
index 33cdbb93f39..4866f845aad 100644
--- a/src/parser/grammar-oper.pg
+++ b/src/parser/grammar-oper.pg
@@ -20,6 +20,7 @@ proto prefix:<!> is equiv(prefix:<+>) { ... }
 proto prefix:<+^> is equiv(prefix:<+>)
     is pirop('bnot')
     { ... }
+proto prefix:<=> is equiv(prefix:<+>) { ... }
 proto prefix:<^> is equiv(prefix:<+>) { ... }
 proto prefix:<\> is equiv(prefix:<+>) { ... }
 proto prefix:<|> is equiv(prefix:<+>) { ... }