fix #28915, identity conversion to union of tuple types #28951
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The problem here was that a definition for converting to
Type{T} where T<:Tupleintercepts unions of tuple types, which might not supportfieldtype. This is the simplest fix I could come up with. So far I haven't found a way to do it with fewer than 6 definitions (2 for each of 3 "kinds" of tuple types). Alternatively, we could makefieldtype(Union{Tuple{}, Tuple{Int}}, 1)returnIntinstead of throwing an error. That would be a more invasive change though, so I left it for later.