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| author | Ryan Scott <ryan.gl.scott@gmail.com> | 2020-05-25 16:11:10 -0400 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2020-06-13 15:58:37 -0400 |
| commit | a31218f7737a65b6333ec7905e88dc094703f025 (patch) | |
| tree | ac5c9a2a8161da0c44605ac4d7ffe5df1719461c /compiler/GHC/Rename/Module.hs | |
| parent | 7a773f169cfe072c7b29924c53075e4dfa4e2adb (diff) | |
| download | haskell-a31218f7737a65b6333ec7905e88dc094703f025.tar.gz | |
Use HsForAllTelescope to avoid inferred, visible foralls
Currently, `HsForAllTy` permits the combination of `ForallVis` and
`Inferred`, but you can't actually typecheck code that uses it
(e.g., `forall {a} ->`). This patch refactors `HsForAllTy` to use a
new `HsForAllTelescope` data type that makes a type-level distinction
between visible and invisible `forall`s such that visible `forall`s
do not track `Specificity`. That part of the patch is actually quite
small; the rest is simply changing consumers of `HsType` to
accommodate this new type.
Fixes #18235. Bumps the `haddock` submodule.
Diffstat (limited to 'compiler/GHC/Rename/Module.hs')
| -rw-r--r-- | compiler/GHC/Rename/Module.hs | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/compiler/GHC/Rename/Module.hs b/compiler/GHC/Rename/Module.hs index 533a794807..e610a60ff3 100644 --- a/compiler/GHC/Rename/Module.hs +++ b/compiler/GHC/Rename/Module.hs @@ -2182,13 +2182,13 @@ rnConDecl (XConDecl (ConDeclGADTPrefixPs { con_gp_names = names, con_gp_ty = ty -- Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts) -- in GHC.Hs.Type. ; case res_ty of - L l (HsForAllTy { hst_fvf = fvf }) - | ForallVis <- fvf + L l (HsForAllTy { hst_tele = tele }) + | HsForAllVis{} <- tele -> setSrcSpan l $ addErr $ withHsDocContext ctxt $ vcat [ text "Illegal visible, dependent quantification" <+> text "in the type of a term" , text "(GHC does not yet support this)" ] - | ForallInvis <- fvf + | HsForAllInvis{} <- tele -> nested_foralls_contexts_err l ctxt L l (HsQualTy {}) -> nested_foralls_contexts_err l ctxt |