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| author | Matthew Pickering <matthewtpickering@gmail.com> | 2019-11-27 15:29:44 +0000 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2020-01-12 05:25:30 -0500 |
| commit | 4ef5871feccc58927428b4eabe46100b25821f15 (patch) | |
| tree | 024ea80f47b361183ff9fb6fd8e5c9cc06452967 /libraries/gen_contents_index | |
| parent | 99a9f51bf8207c79241fc0b685fadeb222a61292 (diff) | |
| download | haskell-wip/overload-th.tar.gz | |
Overloaded Quotation Brackets (#246)wip/overload-th
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
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