Compiler/inference @test Base.return_types((Bool, AliasableField); interp = MustAliasInterpreter()) do b, a #= /cache/build/default-aws-aarch64-ci-1-0/julialang/julia-master/julia-e7ff95d643/share/julia/Compiler/test/inference.jl:2446 =# return merge_same_aliases(b, a) end |> only === Union{Nothing, Int}