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| author | Matthew Pickering <matthewtpickering@gmail.com> | 2019-11-27 15:29:44 +0000 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2020-01-12 21:28:47 -0500 |
| commit | 9129210f7e9937c1065330295f06524661575839 (patch) | |
| tree | 8eee18f92d23eb2fe39adecda1d547fa8d9fa7cb /docs/users_guide/8.12.1-notes.rst | |
| parent | 49f83a0de12a7c02f4a6e99d26eaa362a373afa5 (diff) | |
| download | haskell-9129210f7e9937c1065330295f06524661575839.tar.gz | |
Overloaded Quotation Brackets (#246)
This patch implements overloaded quotation brackets which generalise the
desugaring of all quotation forms in terms of a new minimal interface.
The main change is that a quotation, for example, [e| 5 |], will now
have type `Quote m => m Exp` rather than `Q Exp`. The `Quote` typeclass
contains a single method for generating new names which is used when
desugaring binding structures.
The return type of functions from the `Lift` type class, `lift` and `liftTyped` have
been restricted to `forall m . Quote m => m Exp` rather than returning a
result in a Q monad.
More details about the feature can be read in the GHC proposal.
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0246-overloaded-bracket.rst
Diffstat (limited to 'docs/users_guide/8.12.1-notes.rst')
| -rw-r--r-- | docs/users_guide/8.12.1-notes.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/users_guide/8.12.1-notes.rst b/docs/users_guide/8.12.1-notes.rst index 69890b2c10..70bb901b07 100644 --- a/docs/users_guide/8.12.1-notes.rst +++ b/docs/users_guide/8.12.1-notes.rst @@ -32,6 +32,10 @@ Runtime system Template Haskell ~~~~~~~~~~~~~~~~ + - Implement the Overloaded Quotations proposal (#246). The type of all quotation + forms have now been generalised in terms of a minimal interface necessary for the + implementation rather than the overapproximation of the ``Q`` monad. + ``ghc-prim`` library ~~~~~~~~~~~~~~~~~~~~ |