subtype @test issub_strict(#= /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-grannysmith-C07ZM05NJYVY.0/build/default-grannysmith-C07ZM05NJYVY-0/julialang/julia-master/julia-71a9406bc7/share/julia/test/subtype.jl:185 =# @UnionAll(T, Pair{T, T}), Pair)