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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:
The HsSyn prettyprinter tests patch 499e43824bda967546ebf95ee33ec1f84a114a7c
broke the pretty-printing of Template Haskell-spliced class instances.
Test Plan: ./validate
Reviewers: RyanGlScott, austin, goldfire, bgamari
Reviewed By: RyanGlScott, bgamari
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D3043
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Summary:
Add prettyprinter tests, which take a file, parse it, pretty print it,
re-parse the pretty printed version and then compare the original and
new ASTs (ignoring locations)
Updates haddock submodule to match the AST changes.
There are three issues outstanding
1. Extra parens around a context are not reproduced. This will require an
AST change and will be done in a separate patch.
2. Currently if an `HsTickPragma` is found, this is not pretty-printed,
to prevent noise in the output.
I am not sure what the desired behaviour in this case is, so have left
it as before. Test Ppr047 is marked as expected fail for this.
3. Apart from in a context, the ParsedSource AST keeps all the parens from
the original source. Something is happening in the renamer to remove the
parens around visible type application, causing T12530 to fail, as the
dumped splice decl is after the renamer.
This needs to be fixed by keeping the parens, but I do not know where they
are being removed. I have amended the test to pass, by removing the parens
in the expected output.
Test Plan: ./validate
Reviewers: goldfire, mpickering, simonpj, bgamari, austin
Reviewed By: simonpj, bgamari
Subscribers: simonpj, goldfire, thomie, mpickering
Differential Revision: https://phabricator.haskell.org/D2752
GHC Trac Issues: #3384
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Summary: Fixes #12530.
Test Plan: make test TEST=12530
Reviewers: austin, bgamari, hvr, goldfire
Reviewed By: goldfire
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D2472
GHC Trac Issues: #12530
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