[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 6 commits: Add long-distance info for pattern bindings (#18572)

[Marge Bot]

 Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC


Commits:
67ce72da by Sebastian Graf at 2020-09-10T10:35:33-04:00
Add long-distance info for pattern bindings (#18572)

We didn't consider the RHS of a pattern-binding before, which led to
surprising warnings listed in #18572.

As can be seen from the regression test T18572, we get the expected
output now.

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1207576a by Sebastian Graf at 2020-09-10T10:35:33-04:00
PmCheck: Big refactor using guard tree variants more closely following source syntax (#18565)

Previously, we desugared and coverage checked plain guard trees as
described in Lower Your Guards. That caused (in !3849) quite a bit of
pain when we need to partially recover tree structure of the input
syntax to return covered sets for long-distance information, for
example.

In this refactor, I introduced a guard tree variant for each relevant
source syntax component of a pattern-match (mainly match groups, match,
GRHS, empty case, pattern binding). I made sure to share as much
coverage checking code as possible, so that the syntax-specific checking
functions are just wrappers around the more substantial checking
functions for the LYG primitives (`checkSequence`, `checkGrds`).

The refactoring payed off in clearer code and elimination of all panics
related to assumed guard tree structure and thus fixes #18565.

I also took the liberty to rename and re-arrange the order of functions
and comments in the module, deleted some dead and irrelevant Notes,
wrote some new ones and gave an overview module haddock.

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95455982 by GHC GitLab CI at 2020-09-10T10:36:09-04:00
hadrian: Don't include -fdiagnostics-color in argument hash

Otherwise the input hash will vary with whether colors are requested,
which changed with `isatty`.

Fixes #18672.

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6abe4a1c by Sebastian Graf at 2020-09-10T17:02:00+02:00
.gitignore *.hiedb files

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3777be14 by Sebastian Graf at 2020-09-10T17:03:12+02:00
PmCheck: Handle ⊥ and strict fields correctly (#18341)

In #18341, we discovered an incorrect digression from Lower Your Guards.
This MR changes what's necessary to support properly fixing #18341.

In particular, bottomness constraints are now properly tracked in the
oracle/inhabitation testing, as an additional field
`vi_bot :: Maybe Bool` in `VarInfo`. That in turn allows us to
model newtypes as advertised in the Appendix of LYG and fix #17725.
Proper handling of ⊥ also fixes #17977 (once again) and fixes #18670.

For some reason I couldn't follow, this also fixes #18273.

I also added a couple of regression tests that were missing. Most of
them were already fixed before.

In summary, this patch fixes #18341, #17725, #18273, #17977 and #18670.

Metric Decrease:
    T12227

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1085826b by Ben Gamari at 2020-09-10T17:38:34-04:00
Bump version to 9.0

(cherry picked from commit f218cfc92f7b1a1e01190851972bb9a0e0f3c682)

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12 changed files:

- .gitignore
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Data/Bag.hs
- compiler/GHC/Data/OrdList.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/GuardedRHSs.hs
- compiler/GHC/HsToCore/ListComp.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match.hs-boot
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/PmCheck.hs


The diff was not included because it is too large.


View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/dfb03b7cba48ea8b829c2d2678048e89e45ee88a...1085826b9b5ef2404fc070dff9967d2d0f375b11

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/dfb03b7cba48ea8b829c2d2678048e89e45ee88a...1085826b9b5ef2404fc070dff9967d2d0f375b11
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