2 Nov
2006
2 Nov
'06
7:19 p.m.
On Wed, Nov 01, 2006 at 03:51:57PM -0800, John Meacham wrote:
On Wed, Nov 01, 2006 at 03:15:38PM -0600, Brian Smith wrote:
Instance hiding is an important feature in its own right.
selective importing and exporting of instances is a really tricky technical issue for a lot of reasons, and a bad idea for many others.
As an example of the technical difficulties, recall that with ghc -fglasgow-exts and hugs -98 defer reducing contexts using instances until forced to (see FlexibleContexts). If instances can come and go, this will be even more confusing.