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| author | Ryan Scott <ryan.gl.scott@gmail.com> | 2021-10-31 19:29:11 -0400 |
|---|---|---|
| committer | Ryan Scott <ryan.gl.scott@gmail.com> | 2021-10-31 19:29:18 -0400 |
| commit | 461fd5dbe1395078cac3e7f97fe80d56cbdd3b08 (patch) | |
| tree | c26118db22f2d3367fe304a6366da2ad8f70cec2 /ghc | |
| parent | ea862ef5b3779476e0aa2d20bbae1946d07430f1 (diff) | |
| download | haskell-wip/T20590.tar.gz | |
Fix #20590 with another application of mkHsContextMaybewip/T20590
We were always converting empty GADT contexts to `Just []` in `GHC.ThToHs`,
which caused the pretty-printer to always print them as `() => ...`. This is
easily fixed by using the `mkHsContextMaybe` function when converting GADT
contexts so that empty contexts are turned to `Nothing`. This is in the same
tradition established in commit 4c87a3d1d14f9e28c8aa0f6062e9c4201f469ad7.
In the process of fixing this, I discovered that the `Cxt` argument to
`mkHsContextMaybe` is completely unnecessary, as we can just as well check if
the `LHsContext GhcPs` argument is empty.
Fixes #20590.
Diffstat (limited to 'ghc')
0 files changed, 0 insertions, 0 deletions