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The changes in `GHC.Utils.Outputable` are the bulk of the patch
and drive the rest.
The types `HLine` and `HDoc` in Outputable can be used instead of `SDoc`
and support printing directly to a handle with `bPutHDoc`.
See Note [SDoc versus HDoc] and Note [HLine versus HDoc].
The classes `IsLine` and `IsDoc` are used to make the existing code polymorphic
over `HLine`/`HDoc` and `SDoc`. This is done for X86, PPC, AArch64, DWARF
and dependencies (printing module names, labels etc.).
Co-authored-by: Alexis King <lexi.lambda@gmail.com>
Metric Decrease:
CoOpt_Read
ManyAlternatives
ManyConstructors
T10421
T12425
T12707
T13035
T13056
T13253
T13379
T18140
T18282
T18698a
T18698b
T1969
T20049
T21839c
T21839r
T3064
T3294
T4801
T5321FD
T5321Fun
T5631
T6048
T783
T9198
T9233
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