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Replaces uses of `TcRnUnknownMessage` in `GHC.Tc.Gen.Splice` with
structured diagnostics.
closes #20116
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This patch implements a part of GHC Proposal #229 that covers five
operators:
* the bang operator (!)
* the tilde operator (~)
* the at operator (@)
* the dollar operator ($)
* the double dollar operator ($$)
Based on surrounding whitespace, these operators are disambiguated into
bang patterns, lazy patterns, strictness annotations, type
applications, splices, and typed splices.
This patch doesn't cover the (-) operator or the -Woperator-whitespace
warning, which are left as future work.
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Summary:
This adds TH support for the ImplicitParams and RecursiveDo extensions.
I'm submitting this as one review because I cannot cleanly make
the two commits independent.
Initially, my goal was just to add ImplicitParams support, and
I found that reasonably straightforward, so figured I might
as well use my newfound knowledge to address some other TH omissions.
Test Plan: Validate
Reviewers: goldfire, austin, bgamari, RyanGlScott
Reviewed By: RyanGlScott
Subscribers: carter, RyanGlScott, thomie
GHC Trac Issues: #1262
Differential Revision: https://phabricator.haskell.org/D1979
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