In Harlequin Dylan 1.2 and 2.0 beta 2 the 'print-message' generic
function exported from the format library is sealed. In Gwydion Dylan
it is open. Some of the Gwydion Dylan code (parsergen for example)
adds methods to print-message and will not work in HD as a result.
Reading the help for print-message under HD doesn't say whether it
should be sealed or not but it does say:
"This function exists to define the behavior of the %S format
directive and to allow users the ability to extend the %S
directive."
This gives the impression that it should be open. Generics like
print-object are open as expected.
Should print-message be open or sealed?
Chris.