Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Counter fromListWith reversing constraints order #9547

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Counter fromListWith reversing constraints order #9547

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 3 additions & 1 deletion cabal-install-solver/src/Distribution/Solver/Modular.hs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,9 @@ modularResolver sc (Platform arch os) cinfo iidx sidx pkgConfigDB pprefs pcs pns
-- Indices have to be converted into solver-specific uniform index.
idx = convPIs os arch cinfo gcs (shadowPkgs sc) (strongFlags sc) (solveExecutables sc) iidx sidx
-- Constraints have to be converted into a finite map indexed by PN.
gcs = M.fromListWith (++) (map pair pcs)
-- Preserve the order of the constraints, countering fromListWith
-- reversing the order by using flip (++).
gcs = M.fromListWith (flip (++)) (map pair pcs)
where
pair lpc = (pcName $ unlabelPackageConstraint lpc, [lpc])

Expand Down
Loading