[Git][ghc/ghc][wip/gc-events] 4 commits: Fix kind inference for data types. Again.

[Ben Gamari]

Ben Gamari pushed to branch wip/gc-events at Glasgow Haskell Compiler / GHC


Commits:
62ed6957 by Simon Peyton Jones at 2020-12-08T15:31:41-05:00
Fix kind inference for data types. Again.

This patch fixes several aspects of kind inference for data type
declarations, especially data /instance/ declarations

Specifically

1. In kcConDecls/kcConDecl make it clear that the tc_res_kind argument
   is only used in the H98 case; and in that case there is no result
   kind signature; and hence no need for the disgusting splitPiTys in
   kcConDecls (now thankfully gone).

   The GADT case is a bit different to before, and much nicer.
   This is what fixes #18891.

   See Note [kcConDecls: kind-checking data type decls]

2. Do not look at the constructor decls of a data/newtype instance
   in tcDataFamInstanceHeader. See GHC.Tc.TyCl.Instance
   Note [Kind inference for data family instances].  This was a
   new realisation that arose when doing (1)

   This causes a few knock-on effects in the tests suite, because
   we require more information than before in the instance /header/.

   New user-manual material about this in "Kind inference in data type
   declarations" and "Kind inference for data/newtype instance
   declarations".

3. Minor improvement in kcTyClDecl, combining GADT and H98 cases

4. Fix #14111 and #8707 by allowing the header of a data instance
   to affect kind inferece for the the data constructor signatures;
   as described at length in Note [GADT return types] in GHC.Tc.TyCl

   This led to a modest refactoring of the arguments (and argument
   order) of tcConDecl/tcConDecls.

5. Fix #19000 by inverting the sense of the test in new_locs
   in GHC.Tc.Solver.Canonical.canDecomposableTyConAppOK.

- - - - -
0abe3ddf by Adam Sandberg Ericsson at 2020-12-08T15:32:19-05:00
hadrian: build the _l and _thr_l rts flavours in the develN flavours

The ghc binary requires the eventlog rts since
fc644b1a643128041cfec25db84e417851e28bab

- - - - -
a8a80e05 by Ben Gamari at 2020-12-09T19:25:41-05:00
users guide: Fix syntax errors

Fixes errors introduced by 3a55b3a2574f913d046f3a6f82db48d7f6df32e3.

- - - - -
af3300fb by Ben Gamari at 2020-12-09T19:25:41-05:00
users guide: Describe GC lifecycle events

Every time I am asked about how to interpret these events I need to
figure it out from scratch. It's well past time that the users guide
properly documents these.

- - - - -


30 changed files:

- compiler/GHC/Hs/Extension.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Solver/Canonical.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- docs/users_guide/9.2.1-notes.rst
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/exts/poly_kinds.rst
- docs/users_guide/runtime_control.rst
- docs/users_guide/using-optimisation.rst
- hadrian/src/Settings/Flavours/Development.hs
- rts/Stats.c
- testsuite/tests/dependent/should_fail/T13780a.stderr
- testsuite/tests/deriving/should_compile/T11416.hs
- testsuite/tests/deriving/should_compile/T9359.hs
- + testsuite/tests/gadt/SynDataRec.hs
- testsuite/tests/gadt/all.T
- + testsuite/tests/indexed-types/should_compile/T14111.hs
- + testsuite/tests/indexed-types/should_compile/T8707.hs
- testsuite/tests/indexed-types/should_compile/all.T
- testsuite/tests/indexed-types/should_fail/T8368.stderr
- testsuite/tests/indexed-types/should_fail/T8368a.stderr
- testsuite/tests/patsyn/should_fail/T15685.stderr
- testsuite/tests/polykinds/T13659.stderr
- testsuite/tests/polykinds/T16221a.stderr
- testsuite/tests/th/T11145.stderr
- testsuite/tests/th/T9692.hs
- + testsuite/tests/typecheck/should_compile/T18891.hs
- testsuite/tests/typecheck/should_compile/UnliftedNewtypesUnassociatedFamily.hs
- testsuite/tests/typecheck/should_compile/UnliftedNewtypesUnifySig.hs


The diff was not included because it is too large.


View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/8087a524c35af0f6fa04e2e1bbc5a0a726c91b72...af3300fb1c9af8d85a6ec07d8fa63e937c7e6ead

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/8087a524c35af0f6fa04e2e1bbc5a0a726c91b72...af3300fb1c9af8d85a6ec07d8fa63e937c7e6ead
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