Fix #13337.

The big change is the introduction of solveSomeEqualities. This
is just like solveEqualities, but it doesn't fail if there are unsolved
equalities when it's all done. Anything unsolved is re-emitted. This
is appropriate if we are not kind-generalizing, so this new form
is used when decideKindGeneralizationPlan says not to.

We initially thought that any use of solveEqualities would be tied
to kind generalization, but this isn't true. For example, we need
to solveEqualities a bunch in the "tc" pass in TcTyClsDecls (which
is really desugaring). These equalities are all surely going to be
soluble (if they weren't the "kc" pass would fail), but we still
need to solve them again. Perhaps if the "kc" pass produced type-
checked output that is then desugared, solveEqualities really would
be tied only to kind generalization.

Updates haddock submodule.

Test Plan: ./validate, typecheck/should_compile/T13337

Reviewers: simonpj, bgamari, austin

Reviewed By: simonpj

Subscribers: RyanGlScott, rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D3315

1 files changed, 0 insertions, 0 deletions

diff --git a/utils/haddock b/utils/haddock
-Subproject 9acb2890cdb4369f3bb7fda899ff4d3526040e7
+Subproject 12a6cc9a98b79a4851fbe40a02c56652338d1c3