Intermittent errorshow failure on windows

[Keno]

Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:881
  Expression: startswith(lstrip(output[8]), "┌┌ ")
   Evaluated: startswith("┌  [21] (::Main.Test36Main_errorshow.var\"#h28442b#h28442b##0\")(n::Int32)", "┌┌ ")
Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:883
  Expression: startswith(lstrip(output[10]), "├├ ")
   Evaluated: startswith("├  [22] (::Main.Test36Main_errorshow.var\"#g28442b#g28442b##0\"{Main.Test36Main_errorshow.var\"#f28442b#f28442b##0\"})(n::Int32)", "├├ ")
Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:886
  Expression: startswith(lstrip(output[13]), "├┌ ")
   Evaluated: startswith("┌  [25] (::Main.Test36Main_errorshow.var\"#h28442b#h28442b##0\")(n::Int32)", "├┌ ")
Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:887
  Expression: occursin("f28442b", output[13])
   Evaluated: occursin("f28442b", " ┌  [25] (::Main.Test36Main_errorshow.var\"#h28442b#h28442b##0\")(n::Int32)")
Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:888
  Expression: startswith(lstrip(output[15]), "├├ ")
   Evaluated: startswith("╰────── repeated 2 times", "├├ ")
Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:889
  Expression: occursin("g28442b", output[15])
   Evaluated: occursin("g28442b", " ╰────── repeated 2 times")
Error in testset errorshow:
Test Failed at C:\buildkite-agent\builds\win2k22-amdci6-3\julialang\julia-master\julia-577b8c5c9a\share\julia\test\errorshow.jl:891
  Expression: occursin("f28442b", output[19])
   Evaluated: occursin("f28442b", " │     @ Main.Test36Main_errorshow C:\\buildkite-agent\\builds\\win2k22-amdci6-3\\julialang\\julia-master\\julia-577b8c5c9a\\share\\julia\\test\\errorshow.jl:868")

e.g. https://buildkite.com/julialang/julia-master/builds/49553/steps/canvas?sid=01985dd5-c54b-4a2b-b86e-5e0ee88097c0

Possibly unwinder related?

[BioTurboNick]

This is just on 32-bit windows? I guess these tests need to go inside the non-Win32 branch of that test set.