Update base/compiler/abstractinterpretation.jl

Author: martinholters

base/compiler/abstractinterpretation.jl

@@ -868,7 +868,7 @@ function abstract_iteration(interp::AbstractInterpreter, @nospecialize(itft), @n
     valtype = Bottom
     may_have_terminated = Nothing <: stateordonet
     while valtype !== Any
-        nounion = typeintersect(typesubtract(stateordonet, Nothing, 0), Tuple{Any,Any})
+        nounion = typeintersect(stateordonet, Tuple{Any,Any})
         if nounion === Union{}
             # handle iterator failing or giving an invalid answer below
             nounion = Tuple{Union{}, Union{}}