Changes between Version 19 and Version 20 of WorkingConventions

Timestamp:

05/02/07 02:57:38 (6 years ago)

Author:

simonpj

Comment:

--

WorkingConventions

@@ -41 +41 @@
 
  * New features should be switchable with their own flag, by default off.  We used to have just one flag `-fglasgow-exts` but nowadays we try to be much more selective.
+
+ * We are much happier about features whose implementation is:   
+   * '''Localised''': only a handful of places in the code are changed.
+   * '''Orthogonal''': no new invariants or constraints are added that subsequent changes must bear in mind. This is really important; any change that imposes costs on later, apparently unrelated, changes is much more costly. 
 
  * A new feature should come with