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| author | Ryan Scott <ryan.gl.scott@gmail.com> | 2020-09-13 08:58:40 -0400 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2020-09-15 15:21:43 -0400 |
| commit | 4283feaa9e0826211f7a71d543054c989ea32965 (patch) | |
| tree | 93f96b0599ed403b0180b0416c13f14a193bb1e4 /compiler/GHC/Hs/Instances.hs | |
| parent | b3143f5a0827b640840ef241a30933dc23b69d91 (diff) | |
| download | haskell-4283feaa9e0826211f7a71d543054c989ea32965.tar.gz | |
Introduce and use DerivClauseTys (#18662)
This switches `deriv_clause_tys` so that instead of using a list of
`LHsSigType`s to represent the types in a `deriving` clause, it now
uses a sum type. `DctSingle` represents a `deriving` clause with no
enclosing parentheses, while `DctMulti` represents a clause with
enclosing parentheses. This makes pretty-printing easier and avoids
confusion between `HsParTy` and the enclosing parentheses in
`deriving` clauses, which are different semantically.
Fixes #18662.
Diffstat (limited to 'compiler/GHC/Hs/Instances.hs')
| -rw-r--r-- | compiler/GHC/Hs/Instances.hs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/GHC/Hs/Instances.hs b/compiler/GHC/Hs/Instances.hs index 34afe3a72d..e1f3d29f21 100644 --- a/compiler/GHC/Hs/Instances.hs +++ b/compiler/GHC/Hs/Instances.hs @@ -163,6 +163,11 @@ deriving instance Data (HsDerivingClause GhcPs) deriving instance Data (HsDerivingClause GhcRn) deriving instance Data (HsDerivingClause GhcTc) +-- deriving instance DataIdLR p p => Data (DerivClauseTys p) +deriving instance Data (DerivClauseTys GhcPs) +deriving instance Data (DerivClauseTys GhcRn) +deriving instance Data (DerivClauseTys GhcTc) + -- deriving instance (DataIdLR p p) => Data (ConDecl p) deriving instance Data (ConDecl GhcPs) deriving instance Data (ConDecl GhcRn) |