#2442: Heuristics to improve error messages for badly referenced things
----------------------------+-----------------------------------------------
Reporter: batterseapower | Owner:
Type: proposal | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.9
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown
Os: Unknown |
----------------------------+-----------------------------------------------
Comment (by guest):
I've solved the performance problem purely by making use of an edit-
distance algorithm based on bit-vectors. This is /very fast/. For future
reference, I've actually released it's implementation (plus some other
edit distances, QuickCheck tests for it all etc) on Hackage
(http://hackage.haskell.org/cgi-bin/hackage-scripts/package/edit-
distance).
My stress test was compiling GHC.hs with the Module import commented out.
This generates a number of unbound name errors, each of which has to do a
full scan of the (huge) imported name set. This takes 1 second on my
modified GHC compared with 0.3 seconds on an unmodified one. If this is
not an acceptable speed I can pursue the other performance-improving
possibilities above.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2442#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
