Errors on Julia v1.6

[ranocha]

There are some errors with SimpleMock.jl triggered inside Cassette.jl, see https://github.com/JuliaTesting/SimpleMock.jl/issues/13. To me, it looks like it's something more related to Cassette and might better be fixed there.

• Tests of Trixi.jl based on SimpleMock.jl fail at https://github.com/trixi-framework/Trixi.jl/pull/438/checks?check_run_id=1853639267#step:6:586 with

  TypeError: in Vararg, in count, expected Int64, got Type{Union{StaticArrays.Dynamic, Int64}}
  Stacktrace:
  [1] call(#unused#::Cassette.Context{N, var"#s3", Nothing, P, B, H} where {N<:Cassette.AbstractContextName, var"#s3", P<:Cassette.AbstractPass, B<:Union{Nothing, IdDict{Module, Dict{Symbol, Cassette.BindingMeta}}}, H<:Union{Cassette.DisableHooks, Nothing}}, f::typeof(Core.apply_type), #unused#::Type{A}, #unused#::Type{B}) where {A, B}
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/context.jl:463
  [2] fallback(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Function, ::Vararg{Any, N} where N)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/context.jl:454
  [3] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(Core.apply_type), ::Type{Vararg{Any, N} where N}, ::Type{Union{StaticArrays.Dynamic, Int64}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:545
  [4] overdub
    @ ~/.julia/packages/StaticArrays/NTbHj/src/traits.jl:61 [inlined]
  [5] overdub(overdub_context#257::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, overdub_arguments#258::Type{StaticArrays.Size{(2,)}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [6] overdub
    @ ~/.julia/packages/StaticArrays/NTbHj/src/traits.jl:67 [inlined]
  [7] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Type{StaticArrays.Size}, ::Type{Tuple{2}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [8] overdub
    @ ~/.julia/packages/StaticArrays/NTbHj/src/traits.jl:89 [inlined]
  [9] overdub
    @ ~/.julia/packages/StaticArrays/NTbHj/src/abstractarray.jl:2 [inlined]
  [10] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(length), ::Type{StaticArrays.SVector{2, Float64}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [11] overdub
    @ ~/.julia/packages/StaticArrays/NTbHj/src/convert.jl:29 [inlined]
  [12] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(convert), ::Type{StaticArrays.SVector{2, Float64}}, ::Vector{Float64})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [13] overdub
    @ ./Base.jl:34 [inlined]
  [14] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(setproperty!), ::Trixi.ParallelTree{2}, ::Symbol, ::Vector{Float64})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [15] overdub
    @ ~/work/Trixi.jl/Trixi.jl/src/mesh/parallel_tree.jl:92 [inlined]
  [16] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(Trixi.init!), ::Trixi.ParallelTree{2}, ::Vector{Float64}, ::Float64, ::Bool)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [17] overdub
    @ ~/work/Trixi.jl/Trixi.jl/src/mesh/parallel_tree.jl:78 [inlined]
  [18] overdub
    @ ~/work/Trixi.jl/Trixi.jl/src/mesh/mesh.jl:41 [inlined]
  [19] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Type{Trixi.TreeMesh{2, Trixi.ParallelTree{2}}}, ::Int64, ::Vector{Float64}, ::Float64, ::Bool)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [20] overdub
    @ ~/work/Trixi.jl/Trixi.jl/src/mesh/mesh.jl:74 [inlined]
  [21] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Type{Trixi.TreeMesh{2, Trixi.ParallelTree{2}}}, ::Int64, ::Tuple{Float64, Float64}, ::Int64, ::Bool)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [22] overdub
    @ ~/work/Trixi.jl/Trixi.jl/src/mesh/mesh.jl:74 [inlined]
  [23] overdub
    @ ~/work/Trixi.jl/Trixi.jl/test/test_unit.jl:67 [inlined]
  [24] overdub(::Cassette.Context{nametype(##258), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Main.TestUnit.var"#7#37", ::Main.TestUnit.var"#8#38")
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [25] invokelatest(::Any, ::Any, ::Vararg{Any, N} where N; kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Base ./essentials.jl:707
  [26] invokelatest(::Any, ::Any, ::Vararg{Any, N} where N)
    @ Base ./essentials.jl:706
  [27] mock(f::Function, ctx::Symbol, args::Pair{typeof(Trixi.mpi_nranks), Main.TestUnit.var"#8#38"}; filters::Vector{Function})
    @ SimpleMock ~/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:140
  [28] #mock#35
    @ ~/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:113 [inlined]
  [29] mock(f::Function, args::Pair{typeof(Trixi.mpi_nranks), Main.TestUnit.var"#8#38"})
    @ SimpleMock ~/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:113
  [30] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/test_unit.jl:66 [inlined]
  [31] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [32] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/test_unit.jl:66 [inlined]
  [33] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [34] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/test_unit.jl:65 [inlined]
  [35] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [36] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/test_unit.jl:64 [inlined]
  [37] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [38] top-level scope
    @ ~/work/Trixi.jl/Trixi.jl/test/test_unit.jl:14
  [39] include(fname::String)
    @ Base.MainInclude ./client.jl:444
  [40] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/runtests.jl:44 [inlined]
  [41] macro expansion
    @ timing.jl:206 [inlined]
  [42] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/runtests.jl:43 [inlined]
  [43] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [44] macro expansion
    @ ~/work/Trixi.jl/Trixi.jl/test/runtests.jl:11 [inlined]
  [45] top-level scope
    @ timing.jl:206
  [46] include(fname::String)
    @ Base.MainInclude ./client.jl:444
  [47] top-level scope
    @ none:6
  [48] eval(m::Module, e::Any)
    @ Core ./boot.jl:360
  [49] exec_options(opts::Base.JLOptions)
    @ Base ./client.jl:261
  [50] _start()
    @ Base ./client.jl:485
  Internal error: encountered unexpected error in runtime:
  TypeError(func=:TypeVar, context="upper bound", expected=Type, got=Vararg{Any, N} where N)
  jl_type_error_rt at /buildworker/worker/package_linux64/build/src/rtutils.c:119
  jl_new_typevar at /buildworker/worker/package_linux64/build/src/builtins.c:1125
  TypeVar at ./boot.jl:382
  apply_type_tfunc at ./compiler/tfuncs.jl:1231
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_apply at /buildworker/worker/package_linux64/build/src/builtins.c:672
  builtin_tfunction at ./compiler/tfuncs.jl:1488
  abstract_call_builtin at ./compiler/abstractinterpretation.jl:827
  jfptr_abstract_call_builtin_8526.clone_1 at /opt/hostedtoolcache/julia/1.6.0-rc1/x64/lib/julia/sys.so (unknown line)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  abstract_call_known at ./compiler/abstractinterpretation.jl:958
  abstract_call at ./compiler/abstractinterpretation.jl:1060
  abstract_call at ./compiler/abstractinterpretation.jl:1044
  abstract_eval_statement at ./compiler/abstractinterpretation.jl:1171
  typeinf_local at ./compiler/abstractinterpretation.jl:1449
  typeinf_nocycle at ./compiler/abstractinterpretation.jl:1507
  _typeinf at ./compiler/typeinfer.jl:214
  typeinf at ./compiler/typeinfer.jl:209
  typeinf_edge at ./compiler/typeinfer.jl:806
  abstract_call_method at ./compiler/abstractinterpretation.jl:490
  abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:143
  abstract_call_known at ./compiler/abstractinterpretation.jl:1037
  abstract_call at ./compiler/abstractinterpretation.jl:1060
  abstract_apply at ./compiler/abstractinterpretation.jl:739
  abstract_call_known at ./compiler/abstractinterpretation.jl:956
  abstract_call at ./compiler/abstractinterpretation.jl:1060
  abstract_call at ./compiler/abstractinterpretation.jl:1044
  abstract_eval_statement at ./compiler/abstractinterpretation.jl:1171
  typeinf_local at ./compiler/abstractinterpretation.jl:1449
  typeinf_nocycle at ./compiler/abstractinterpretation.jl:1507
  _typeinf at ./compiler/typeinfer.jl:214
  typeinf at ./compiler/typeinfer.jl:209
  typeinf_edge at ./compiler/typeinfer.jl:806
  abstract_call_method at ./compiler/abstractinterpretation.jl:490
  abstract_call_gf_by_type at ./compiler/abstractinterpretation.jl:143
  abstract_call_known at ./compiler/abstractinterpretation.jl:1037
  abstract_call at ./compiler/abstractinterpretation.jl:1060
  abstract_apply at ./compiler/abstractinterpretation.jl:739
  abstract_call_known at ./compiler/abstractinterpretation.jl:956
  abstract_call at ./compiler/abstractinterpretation.jl:1060
  abstract_call at ./compiler/abstractinterpretation.jl:1044
  abstract_eval_statement at ./compiler/abstractinterpretation.jl:1171
  typeinf_local at ./compiler/abstractinterpretation.jl:1449
  typeinf_nocycle at ./compiler/abstractinterpretation.jl:1507
  _typeinf at ./compiler/typeinfer.jl:214
  typeinf at ./compiler/typeinfer.jl:209
  typeinf_ext at ./compiler/typeinfer.jl:892
  typeinf_ext_toplevel at ./compiler/typeinfer.jl:925
  typeinf_ext_toplevel at ./compiler/typeinfer.jl:921
  jfptr_typeinf_ext_toplevel_14033.clone_1 at /opt/hostedtoolcache/julia/1.6.0-rc1/x64/lib/julia/sys.so (unknown line)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  jl_type_infer at /buildworker/worker/package_linux64/build/src/gf.c:298
  jl_generate_fptr at /buildworker/worker/package_linux64/build/src/jitlayers.cpp:340
  jl_compile_method_internal at /buildworker/worker/package_linux64/build/src/gf.c:1971
  jl_compile_method_internal at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2230 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  overdub at /home/runner/.julia/packages/StaticArrays/NTbHj/src/traits.jl:61 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  unknown function (ip: 0x7fa48d3e6141)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  overdub at /home/runner/.julia/packages/StaticArrays/NTbHj/src/traits.jl:67 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  overdub at /home/runner/.julia/packages/StaticArrays/NTbHj/src/traits.jl:89 [inlined]
  overdub at /home/runner/.julia/packages/StaticArrays/NTbHj/src/abstractarray.jl:2 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  overdub at /home/runner/.julia/packages/StaticArrays/NTbHj/src/convert.jl:29 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  unknown function (ip: 0x7fa48d3e5ab5)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  overdub at ./Base.jl:34 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  overdub at /home/runner/work/Trixi.jl/Trixi.jl/src/mesh/parallel_tree.jl:92 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  overdub at /home/runner/work/Trixi.jl/Trixi.jl/src/mesh/parallel_tree.jl:78 [inlined]
  overdub at /home/runner/work/Trixi.jl/Trixi.jl/src/mesh/mesh.jl:41 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  unknown function (ip: 0x7fa48d3d0aaf)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  overdub at /home/runner/work/Trixi.jl/Trixi.jl/src/mesh/mesh.jl:74 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  overdub at /home/runner/work/Trixi.jl/Trixi.jl/src/mesh/mesh.jl:74 [inlined]
  overdub at /home/runner/work/Trixi.jl/Trixi.jl/test/test_unit.jl:91 [inlined]
  overdub at /home/runner/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  unknown function (ip: 0x7fa4cdb003b1)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_apply at /buildworker/worker/package_linux64/build/src/builtins.c:672
  jl_f__apply_latest at /buildworker/worker/package_linux64/build/src/builtins.c:722
  #invokelatest#2 at ./essentials.jl:707
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_apply at /buildworker/worker/package_linux64/build/src/builtins.c:672
  invokelatest at ./essentials.jl:706
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_apply at /buildworker/worker/package_linux64/build/src/builtins.c:672
  #mock#36 at /home/runner/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:140
  mock##kw at /home/runner/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:117 [inlined]
  #mock#35 at /home/runner/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:113 [inlined]
  mock at /home/runner/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:113
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:115
  eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:204
  eval_stmt_value at /buildworker/worker/package_linux64/build/src/interpreter.c:155 [inlined]
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:561
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:669
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/test_unit.jl:90 [inlined]
  macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/test_unit.jl:90 [inlined]
  macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/test_unit.jl:65 [inlined]
  macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/test_unit.jl:64 [inlined]
  macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  top-level scope at /home/runner/work/Trixi.jl/Trixi.jl/test/test_unit.jl:14
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:879
  jl_eval_module_expr at /buildworker/worker/package_linux64/build/src/toplevel.c:197 [inlined]
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:670
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:827
  jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/toplevel.c:931
  eval at ./boot.jl:360 [inlined]
  include_string at ./loading.jl:1090
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  _include at ./loading.jl:1144
  include at ./client.jl:444
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:115
  eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:204
  eval_stmt_value at /buildworker/worker/package_linux64/build/src/interpreter.c:155 [inlined]
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:561
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:489
  jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:669
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/runtests.jl:44 [inlined]
  macro expansion at timing.jl:206 [inlined]
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/runtests.jl:43 [inlined]
  macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  macro expansion at /home/runner/work/Trixi.jl/Trixi.jl/test/runtests.jl:11 [inlined]
  top-level scope at timing.jl:206
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:879
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:827
  jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/toplevel.c:931
  eval at ./boot.jl:360 [inlined]
  include_string at ./loading.jl:1090
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  _include at ./loading.jl:1144
  include at ./client.jl:444
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:115
  eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:204
  eval_stmt_value at /buildworker/worker/package_linux64/build/src/interpreter.c:155 [inlined]
  eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:561
  jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:669
  top-level scope at none:6
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:879
  jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:827
  jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/toplevel.c:931
  eval at ./boot.jl:360
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  exec_options at ./client.jl:261
  _start at ./client.jl:485
  jfptr__start_50107.clone_1 at /opt/hostedtoolcache/julia/1.6.0-rc1/x64/lib/julia/sys.so (unknown line)
  _jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2238 [inlined]
  jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2420
  jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
  true_main at /buildworker/worker/package_linux64/build/src/jlapi.c:557
  repl_entrypoint at /buildworker/worker/package_linux64/build/src/jlapi.c:699
  main at /buildworker/worker/package_linux64/build/cli/loader_exe.c:51
  __libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
  _start at /opt/hostedtoolcache/julia/1.6.0-rc1/x64/bin/julia (unknown line)

• https://github.com/JuliaTesting/SimpleMock.jl/issues/13#issuecomment-774652434: Tests of SimpleMock.jl fail with

  Multiple mocks: Error During Test at /~/.julia/packages/SimpleMock/zgRuh/test/mock_fun.jl:33
  Got exception outside of a @test
  MethodError: no method matching Int64(::Mock{SimpleMock.var"#15#17"{SimpleMock.var"#15#16#18"}})
  Closest candidates are:
  (::Type{T})(::AbstractChar) where T<:Union{AbstractChar, Number} at char.jl:50
  (::Type{T})(::BigInt) where T<:Union{Int128, Int16, Int32, Int64, Int8} at gmp.jl:356
  (::Type{T})(::Base.TwicePrecision) where T<:Number at twiceprecision.jl:243
  ...
  Stacktrace:
  [1] call
    @ ~/.julia/packages/Cassette/Wjztv/src/context.jl:456 [inlined]
  [2] fallback
    @ ~/.julia/packages/Cassette/Wjztv/src/context.jl:454 [inlined]
  [3] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Type{Int64}, ::Mock{SimpleMock.var"#15#17"{SimpleMock.var"#15#16#18"}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:545
  [4] overdub
    @ ./abstractarray.jl:1113 [inlined]
  [5] overdub
    @ ./array.jl:265 [inlined]
  [6] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(unsafe_copyto!), ::Vector{Union{Ptr{Nothing}, Base.InterpreterIP}}, ::Int64, ::Vector{Union{Ptr{Nothing}, Base.InterpreterIP}}, ::Int64, ::Int64)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [7] overdub
    @ ./array.jl:811 [inlined]
  [8] overdub
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:56 [inlined]
  [9] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(Test.scrub_backtrace), ::Vector{Union{Ptr{Nothing}, Base.InterpreterIP}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [10] overdub
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:62 [inlined]
  [11] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(Test.scrub_exc_stack), ::Vector{Any})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [12] overdub
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:165 [inlined]
  [13] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::Type{Test.Error}, ::Symbol, ::Expr, ::MethodError, ::Vector{Any}, ::LineNumberNode)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [14] overdub
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:553 [inlined]
  [15] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::typeof(Test.do_test), ::Test.Threw, ::Expr)
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [16] overdub
    @ ~/.julia/packages/SimpleMock/zgRuh/test/mock_fun.jl:37 [inlined]
  [17] overdub(::Cassette.Context{nametype(##334), SimpleMock.Metadata{false}, Nothing, Cassette.var"##PassType#259", Nothing, Nothing}, ::var"#13#14", ::Mock{SimpleMock.var"#15#17"{SimpleMock.var"#15#16#18"}}, ::Mock{SimpleMock.var"#15#17"{SimpleMock.var"#15#16#18"}})
    @ Cassette ~/.julia/packages/Cassette/Wjztv/src/overdub.jl:0
  [18] invokelatest(::Any, ::Any, ::Vararg{Any, N} where N; kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Base ./essentials.jl:707
  [19] invokelatest(::Any, ::Any, ::Vararg{Any, N} where N)
    @ Base ./essentials.jl:706
  [20] mock(::Function, ::Symbol, ::Function, ::Vararg{Function, N} where N; filters::Vector{Function})
    @ SimpleMock ~/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:140
  [21] #mock#35
    @ ~/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:113 [inlined]
  [22] mock(::Function, ::Function, ::Function)
    @ SimpleMock ~/.julia/packages/SimpleMock/zgRuh/src/mock_fun.jl:113
  [23] macro expansion
    @ ~/.julia/packages/SimpleMock/zgRuh/test/mock_fun.jl:34 [inlined]
  [24] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [25] top-level scope
    @ ~/.julia/packages/SimpleMock/zgRuh/test/mock_fun.jl:34
  [26] include(fname::String)
    @ Base.MainInclude ./client.jl:444
  [27] macro expansion
    @ ~/.julia/packages/SimpleMock/zgRuh/test/runtests.jl:14 [inlined]
  [28] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [29] macro expansion
    @ ~/.julia/packages/SimpleMock/zgRuh/test/runtests.jl:14 [inlined]
  [30] macro expansion
    @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Test/src/Test.jl:1151 [inlined]
  [31] top-level scope
    @ ~/.julia/packages/SimpleMock/zgRuh/test/runtests.jl:10
  [32] include(fname::String)
    @ Base.MainInclude ./client.jl:444
  [33] top-level scope
    @ none:6
  [34] eval(m::Module, e::Any)
    @ Core ./boot.jl:360
  [35] exec_options(opts::JLOptions)
    @ Base ./client.jl:261
  [36] _start()
    @ Base ./client.jl:485

[vchuravy]

Can you condense this to a smaller example/MWE, that only uses Cassette? I don't know SimpleMocks internals.

[ranocha]

I'm also not part of the SimpleMock developer team, I just recognized this in our tests. Maybe @christopher-dG could help to debug this issue?

[christopher-dG]

I'm trying a bit to get a MWE (without SimpleMock), but not having success thus far.