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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2021-05-04 08:45:08 +0100 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2021-05-07 09:43:57 -0400 |
| commit | 8e0f48bdd6e83279939d8fdd2ec1e5707725030d (patch) | |
| tree | bc65d57cf1c9b05acc5f54a9627ecfce465e6e0c /compiler/GHC/Tc/Types | |
| parent | a664a2ad6432ad19799cf5670311f5d1aaac0559 (diff) | |
| download | haskell-8e0f48bdd6e83279939d8fdd2ec1e5707725030d.tar.gz | |
Allow visible type application for levity-poly data cons
This patch was driven by #18481, to allow visible type application
for levity-polymorphic newtypes. As so often, it started simple
but grew:
* Significant refactor: I removed HsConLikeOut from the
client-independent Language.Haskell.Syntax.Expr, and put it where it
belongs, as a new constructor `ConLikeTc` in the GHC-specific extension
data type for expressions, `GHC.Hs.Expr.XXExprGhcTc`.
That changed touched a lot of files in a very superficial way.
* Note [Typechecking data constructors] explains the main payload.
The eta-expansion part is no longer done by the typechecker, but
instead deferred to the desugarer, via `ConLikeTc`
* A little side benefit is that I was able to restore VTA for
data types with a "stupid theta": #19775. Not very important,
but the code in GHC.Tc.Gen.Head.tcInferDataCon is is much, much
more elegant now.
* I had to refactor the levity-polymorphism checking code in
GHC.HsToCore.Expr, see
Note [Checking for levity-polymorphic functions]
Note [Checking levity-polymorphic data constructors]
Diffstat (limited to 'compiler/GHC/Tc/Types')
| -rw-r--r-- | compiler/GHC/Tc/Types/Origin.hs | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/compiler/GHC/Tc/Types/Origin.hs b/compiler/GHC/Tc/Types/Origin.hs index 668dbb024c..b386c65a39 100644 --- a/compiler/GHC/Tc/Types/Origin.hs +++ b/compiler/GHC/Tc/Types/Origin.hs @@ -499,7 +499,6 @@ exprCtOrigin :: HsExpr GhcRn -> CtOrigin exprCtOrigin (HsVar _ (L _ name)) = OccurrenceOf name exprCtOrigin (HsGetField _ _ (L _ f)) = HasFieldOrigin (unLoc $ hflLabel f) exprCtOrigin (HsUnboundVar {}) = Shouldn'tHappenOrigin "unbound variable" -exprCtOrigin (HsConLikeOut {}) = panic "exprCtOrigin HsConLikeOut" exprCtOrigin (HsRecFld _ f) = OccurrenceOfRecSel (rdrNameAmbiguousFieldOcc f) exprCtOrigin (HsOverLabel _ l) = OverLabelOrigin l exprCtOrigin (ExplicitList {}) = ListOrigin |