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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2017-10-09 13:16:59 +0100 |
|---|---|---|
| committer | Simon Peyton Jones <simonpj@microsoft.com> | 2017-10-11 12:33:29 +0100 |
| commit | f20cf982f126aea968ed6a482551550ffb6650cf (patch) | |
| tree | cba52af91ab61484d29067e0c44b7d5cc24d57d5 /testsuite/tests/deriving | |
| parent | 3e44562ae18526ae0df6370078321dd19b00616f (diff) | |
| download | haskell-f20cf982f126aea968ed6a482551550ffb6650cf.tar.gz | |
Remove wc_insol from WantedConstraints
This patch is a pure refactoring, which I've wanted to do for
some time. The main payload is
* Remove the wc_insol field from WantedConstraints;
instead put all the insolubles in wc_simple
* Remove inert_insols from InertCans
Instead put all the insolubles in inert_irreds
* Add a cc_insol flag to CIrredCan, to record that
the constraint is definitely insoluble
Reasons
* Quite a bit of code gets slightly simpler
* Fewer concepts to keep separate
* Insolubles don't happen at all in production code that is
just being recompiled, so previously there was a lot of
moving-about of empty sets
A couple of error messages acutally improved.
Diffstat (limited to 'testsuite/tests/deriving')
| -rw-r--r-- | testsuite/tests/deriving/should_fail/T3621.stderr | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/testsuite/tests/deriving/should_fail/T3621.stderr b/testsuite/tests/deriving/should_fail/T3621.stderr index 88004bb230..ec68e81f41 100644 --- a/testsuite/tests/deriving/should_fail/T3621.stderr +++ b/testsuite/tests/deriving/should_fail/T3621.stderr @@ -1,9 +1,15 @@ T3621.hs:24:43: error: - • No instance for (MonadState state (State s)) - arising from the 'deriving' clause of a data type declaration - Possible fix: - use a standalone 'deriving instance' declaration, - so you can specify the instance context yourself + • Couldn't match type ‘s’ with ‘state’ + arising from a functional dependency between: + constraint ‘MonadState state (State s)’ + arising from the 'deriving' clause of a data type declaration + instance ‘MonadState s1 (State s1)’ at T3621.hs:21:10-31 + ‘s’ is a rigid type variable bound by + the deriving clause for ‘MonadState state (WrappedState s)’ + at T3621.hs:24:43-58 + ‘state’ is a rigid type variable bound by + the deriving clause for ‘MonadState state (WrappedState s)’ + at T3621.hs:24:43-58 • When deriving the instance for (MonadState state (WrappedState s)) |