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Make apply_type_nothrow
robust against TypeVar
s in upper bounds
#49863
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For types like `Foo{S, T<:S}`, `apply_type_nothrow` could in some situations check whether the argument is a subtype of the upper bound of `T`, i.e. `S`, but subtyping agaist a plain `TypeVar` would fail. Instead return `false` in this case. Fixes #49785.
aviatesk
approved these changes
May 18, 2023
everywhere. Is that happening elsewhere, too? Or could this PR have caused it? |
Just needs a rebase. (which I did) |
vtjnash
reviewed
May 20, 2023
@@ -1665,7 +1665,7 @@ function apply_type_nothrow(𝕃::AbstractLattice, argtypes::Vector{Any}, @nospe | |||
end | |||
else | |||
istype || return false | |||
if !(T <: u.var.ub) | |||
if isa(u.var.ub, TypeVar) || !(T <: u.var.ub) |
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This could also do has_free_typevars(u.var.ub)
to cover some other (even more rare) cases
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For types like
Foo{S, T<:S}
,apply_type_nothrow
could in some situations check whether the argument is a subtype of the upper bound ofT
, i.e.S
, but subtyping agaist a plainTypeVar
would fail. Instead returnfalse
in this case.Fixes #49785.