add a subtyping fast path for tuple of Unions <: Vararg #33353
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JeffBezanson
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Keno
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| goto done; // if y ends in `Vararg{Any}` skip checking everything | ||
| // var T in Vararg{T} is diagonal; an abstract type can't be a subtype of it, | ||
| // so avoid exponential blowup when xi is a Union. | ||
| if (jl_is_typevar(yi) && jl_is_uniontype(xi) && !jl_has_free_typevars(xi)) |
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There’s also a concrete_min (which does this for obvious-subtype). But we discovered this was false, I thought, because T wasn’t know to be diagonal
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Hmm, ok, I can patch that up.
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fixes #33337
Replacement for #33345 that improves subtyping instead of reverting.