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[CS] Allow InsertExplicitCall for higher-order functions

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Allow `InsertExplicitCall` for e.g converting
`() -> () -> Void` to `() -> Void`. No test since
it's already covered in the test suite when the
next commit is applied.
This commit is contained in:
Hamish Knight
2024-12-29 12:25:18 +00:00
parent 55189bae8e
commit 2c2038d459
1 changed files with 10 additions and 5 deletions
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15
lib/Sema/CSSimplify.cpp
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@@ -5186,11 +5186,16 @@ bool ConstraintSystem::repairFailures(
// side isn't, let's check it would be possible to fix
// this by forming an explicit call.
auto convertTo = dstType->lookThroughAllOptionalTypes();
// Right-hand side can't be - a function, a type variable or dependent
// member, or `Any` (if function conversion to `Any` didn't succeed there
// is something else going on e.g. problem with escapiness).
if (convertTo->is<FunctionType>() || convertTo->isTypeVariableOrMember() ||
convertTo->isAny())
// If the RHS is a function type, the source must be a function-returning
// function.
if (convertTo->is<FunctionType>() && !resultType->is<FunctionType>())
return false;
// Right-hand side can't be a type variable or dependent member, or `Any`
// (if function conversion to `Any` didn't succeed there is something else
// going on e.g. problem with escapiness).
if (convertTo->isTypeVariableOrMember() || convertTo->isAny())
return false;
ConstraintKind matchKind;