[CSBindings] Account for literal bindings when checking "subtype of e… #37643
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hborla
approved these changes
May 25, 2021
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@swift-ci please test |
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@swift-ci please test source compatibility |
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…xistential" property It's important to know whether a binding set has all of its bindings as subtypes of some existential type(s), type variables like that should be delayed. Incremental binding inference introduced a bug into computation of this property by checking only directly inferable bindings, but it's also important to check that there are no literal requirements that can produce bindings, because that would mean that type variable can never be just a subtype of existential type(s). Resolves: rdar://77570994
xedin
commented
May 26, 2021
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…xistential" property
It's important to know whether a binding set has all of its bindings
as subtypes of some existential type(s), type variables like that
should be delayed.
Incremental binding inference introduced a bug into computation of
this property by checking only directly inferable bindings, but
it's also important to check that there are no literal requirements
that can produce bindings, because that would mean that type variable
can never be just a subtype of existential type(s).
Resolves: rdar://77570994