pkg> st fails second time around with ERROR: MethodError: no method matching Int64(::Dates.DateTime)

[PallHaraldsson]

This is a very strange bug to me, and likely has nothing to do with PythonCall, though seemingly the only thing triggering it, showing verbatim:

$ julia +1.11
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.0-rc3 (2024-08-26)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23 `~/.julia/dev/PythonCall`

julia> @time_imports using PythonCall
     10.9 ms  UnsafePointers
      0.9 ms  Printf
     81.7 ms  Dates
      0.3 ms  UUIDs
      1.4 ms  TOML
     23.2 ms  Preferences
      0.4 ms  PrecompileTools
               ┌ 0.0 ms Parsers.__init__() 
    254.0 ms  Parsers 78.78% compilation time
      0.6 ms  Mmap
      7.3 ms  StructTypes
     53.1 ms  JSON3
      0.4 ms  Pidfile
      1.3 ms  Base64
               ┌ 0.0 ms NetworkOptions.__init__() 
      3.3 ms  NetworkOptions
               ┌ 0.0 ms MbedTLS_jll.__init__() 
      3.4 ms  MbedTLS_jll
               ┌ 0.0 ms LibSSH2_jll.__init__() 
      3.1 ms  LibSSH2_jll
               ┌ 0.0 ms LibGit2_jll.__init__() 
      3.1 ms  LibGit2_jll
     15.3 ms  LibGit2
     15.9 ms  ArgTools
               ┌ 0.0 ms nghttp2_jll.__init__() 
      3.5 ms  nghttp2_jll
               ┌ 0.0 ms LibCURL_jll.__init__() 
      4.2 ms  LibCURL_jll
               ┌ 0.0 ms MozillaCACerts_jll.__init__() 
      3.8 ms  MozillaCACerts_jll
               ┌ 0.0 ms LibCURL.__init__() 
      1.5 ms  LibCURL
               ┌ 0.0 ms Downloads.Curl.__init__() 
     28.4 ms  Downloads
      1.1 ms  Tar
               ┌ 0.1 ms p7zip_jll.__init__() 
      5.4 ms  p7zip_jll
      0.2 ms  Logging
     16.7 ms  Markdown
               ┌ 0.0 ms Pkg.__init__() 
    388.8 ms  Pkg
      0.3 ms  Scratch
      0.2 ms  LazyArtifacts
      0.4 ms  JLLWrappers
               ┌ 5.4 ms micromamba_jll.__init__() 95.66% compilation time
      5.8 ms  micromamba_jll 88.54% compilation time
      0.4 ms  MicroMamba
               ┌ 248.0 ms CondaPkg.PkgREPL.__init__() 99.49% compilation time
    252.4 ms  CondaPkg 97.76% compilation time
               ┌ 0.0 ms Requires.__init__() 
      0.5 ms  Requires
     13.1 ms  MacroTools
      0.2 ms  DataValueInterfaces
      1.0 ms  DataAPI
      0.2 ms  IteratorInterfaceExtensions
      0.2 ms  TableTraits
      4.5 ms  OrderedCollections
     15.9 ms  Tables
      1.3 ms  Serialization
               ┌ 1822.4 ms PythonCall.C.__init__() 90.45% compilation time
               ├ 0.0 ms PythonCall.GC.__init__() 
               ├ 1016.6 ms PythonCall.Core.__init__() 96.71% compilation time
               ├ 160.5 ms PythonCall.Convert.__init__() 99.50% compilation time
               ├ 0.0 ms PythonCall.Wrap.__init__() 
               ├ 0.0 ms PythonCall.JlWrap.Cjl.__init__() 
               ├ 67.3 ms PythonCall.JlWrap.__init__() 81.75% compilation time
               ├ 23.0 ms PythonCall.Compat.__init__() 94.89% compilation time
   3197.9 ms  PythonCall 89.68% compilation time

(@v1.11) pkg> st
ERROR: MethodError: no method matching Int64(::Dates.DateTime)
The type `Int64` exists, but no method is defined for this combination of argument types when trying to construct it.

Closest candidates are:
  Int64(::Float64)
   @ Base float.jl:990
  Int64(::Float32)
   @ Base float.jl:990
  Int64(::Float16)
   @ Base float.jl:990
  ...

Stacktrace:
  [1] Dates.DateTime(y::Dates.DateTime, m::Int64, d::Int64, h::Int64, mi::Int64, s::Int64, ms::Int64, ampm::Dates.AMPM)
    @ Dates ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Dates/src/types.jl:421
  [2] (::Pkg.Types.var"#53#56"{String, String})(d::Dict{String, Any})
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:556
  [3] iterate
    @ ./generator.jl:48 [inlined]
  [4] _collect(c::Vector{Any}, itr::Base.Generator{Vector{Any}, Pkg.Types.var"#53#56"{String, String}}, ::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:800
  [5] collect_similar(cont::Vector{Any}, itr::Base.Generator{Vector{Any}, Pkg.Types.var"#53#56"{String, String}})
    @ Base ./array.jl:709
  [6] map(f::Function, A::Vector{Any})
    @ Base ./abstractarray.jl:3374
  [7] (::Pkg.Types.var"#52#55"{String, String, Dates.DateTime, String})()
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:554
  [8] mkpidlock(f::Pkg.Types.var"#52#55"{String, String, Dates.DateTime, String}, at::String, pid::Int32; kwopts::@Kwargs{stale_age::Int64})
    @ FileWatching.Pidfile ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:95
  [9] mkpidlock
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:92 [inlined]
 [10] mkpidlock
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:90 [inlined]
 [11] write_env_usage(source_file::String, usage_filepath::String)
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:537
 [12] Pkg.Types.EnvCache(env::Nothing)
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:375
 [13] EnvCache
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:354 [inlined]
 [14] Context
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:404 [inlined]
 [15] status(pkgs::Vector{Pkg.Types.PackageSpec}; io::IOContext{IO}, kwargs::@Kwargs{})
    @ Pkg.API ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/API.jl:150
 [16] status(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/API.jl:148
 [17] do_cmd(command::Pkg.REPLMode.Command, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/REPLMode/REPLMode.jl:407
 [18] do_cmds(commands::Vector{Pkg.REPLMode.Command}, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/REPLMode/REPLMode.jl:393
 [19] do_cmds(repl::REPL.LineEditREPL, commands::String)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:92
 [20] on_done(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool, repl::REPL.LineEditREPL)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:106
 [21] #invokelatest#2
    @ ./essentials.jl:1054 [inlined]
 [22] invokelatest
    @ ./essentials.jl:1051 [inlined]
 [23] (::REPLExt.var"#47#50"{REPL.LineEditREPL})(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:128
 [24] #invokelatest#2
    @ ./essentials.jl:1054 [inlined]
 [25] invokelatest
    @ ./essentials.jl:1051 [inlined]
 [26] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2749
 [27] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1456
 [28] (::REPL.var"#75#81"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:461

(@v1.11) pkg> st
ERROR: MethodError: no method matching Int64(::Dates.DateTime)

Yes, I'm deving the package (and Markdown its dependency, seemingly successfully, just added precompile statements there), but I didn't really change PythonCall, some very minor changes, besides they shouldn't make this happen?!

[PallHaraldsson]

Note segfault when trying similar (why not in my original report?), just opened another tab and Julia, again verbatim:

$ julia +1.11
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.0-rc3 (2024-08-26)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23 `~/.julia/dev/PythonCall`

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23 `~/.julia/dev/PythonCall`

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23 `~/.julia/dev/PythonCall`

julia> @time_imports using PythonCall
      9.5 ms  UnsafePointers
      1.0 ms  Printf
     79.7 ms  Dates
      0.3 ms  UUIDs
      1.2 ms  TOML
     20.9 ms  Preferences
      0.4 ms  PrecompileTools
               ┌ 0.1 ms Parsers.__init__() 
    270.0 ms  Parsers 81.91% compilation time
      0.9 ms  Mmap
      9.4 ms  StructTypes
     77.7 ms  JSON3
      0.5 ms  Pidfile
      1.5 ms  Base64
               ┌ 0.0 ms NetworkOptions.__init__() 
      5.0 ms  NetworkOptions
               ┌ 0.1 ms MbedTLS_jll.__init__() 
      6.4 ms  MbedTLS_jll
               ┌ 0.1 ms LibSSH2_jll.__init__() 
      4.5 ms  LibSSH2_jll
               ┌ 0.1 ms LibGit2_jll.__init__() 
      5.3 ms  LibGit2_jll
     20.9 ms  LibGit2
     21.0 ms  ArgTools
               ┌ 0.1 ms nghttp2_jll.__init__() 
      4.3 ms  nghttp2_jll
               ┌ 0.1 ms LibCURL_jll.__init__() 
      6.3 ms  LibCURL_jll
               ┌ 0.0 ms MozillaCACerts_jll.__init__() 
      5.4 ms  MozillaCACerts_jll
               ┌ 0.0 ms LibCURL.__init__() 
      1.9 ms  LibCURL
               ┌ 0.0 ms Downloads.Curl.__init__() 
     39.6 ms  Downloads
      1.9 ms  Tar
               ┌ 0.1 ms p7zip_jll.__init__() 
      7.7 ms  p7zip_jll
      0.3 ms  Logging
     21.8 ms  Markdown
               ┌ 0.0 ms Pkg.__init__() 
    525.0 ms  Pkg
      0.4 ms  Scratch
      0.2 ms  LazyArtifacts
      0.4 ms  JLLWrappers
               ┌ 5.9 ms micromamba_jll.__init__() 94.27% compilation time
      6.4 ms  micromamba_jll 87.16% compilation time
      0.6 ms  MicroMamba
               ┌ 297.6 ms CondaPkg.PkgREPL.__init__() 99.64% compilation time
    302.4 ms  CondaPkg 98.05% compilation time
               ┌ 0.0 ms Requires.__init__() 
      0.7 ms  Requires
     16.9 ms  MacroTools
      0.4 ms  DataValueInterfaces
      1.4 ms  DataAPI
      0.3 ms  IteratorInterfaceExtensions
      0.3 ms  TableTraits
      5.3 ms  OrderedCollections
     21.7 ms  Tables
      1.5 ms  Serialization
               ┌ 1900.8 ms PythonCall.C.__init__() 90.32% compilation time
               ├ 0.0 ms PythonCall.GC.__init__() 
               ├ 
[2001444] signal 11 (1): Segmentation fault
in expression starting at REPL[1]:1
pymalloc_alloc at /usr/local/src/conda/python-3.12.5/Objects/obmalloc.c:1544 [inlined]
_PyObject_Malloc at /usr/local/src/conda/python-3.12.5/Objects/obmalloc.c:1564 [inlined]
PyObject_Malloc at /usr/local/src/conda/python-3.12.5/Objects/obmalloc.c:801 [inlined]
gc_alloc at /usr/local/src/conda/python-3.12.5/Modules/gcmodule.c:2307 [inlined]
_PyObject_GC_New at /usr/local/src/conda/python-3.12.5/Modules/gcmodule.c:2322 [inlined]
PyMethod_New at /usr/local/src/conda/python-3.12.5/Objects/classobject.c:113 [inlined]
func_descr_get at /usr/local/src/conda/python-3.12.5/Objects/funcobject.c:895
_PyEval_EvalFrameDefault at /home/conda/feedstock_root/build_artifacts/python-split_1723141048588/work/build-shared/Python/bytecodes.c:2501
_PyObject_VectorcallTstate at /usr/local/src/conda/python-3.12.5/Include/internal/pycore_call.h:92 [inlined]
object_vacall at /usr/local/src/conda/python-3.12.5/Objects/call.c:850
PyObject_CallMethodObjArgs at /usr/local/src/conda/python-3.12.5/Objects/call.c:911
import_find_and_load at /usr/local/src/conda/python-3.12.5/Python/import.c:2779 [inlined]
PyImport_ImportModuleLevelObject at /usr/local/src/conda/python-3.12.5/Python/import.c:2862
builtin___import___impl at /usr/local/src/conda/python-3.12.5/Python/bltinmodule.c:275 [inlined]
builtin___import__ at /usr/local/src/conda/python-3.12.5/Python/clinic/bltinmodule.c.h:107
cfunction_vectorcall_FASTCALL_KEYWORDS at /usr/local/src/conda/python-3.12.5/Objects/methodobject.c:438
_PyObject_VectorcallTstate at /usr/local/src/conda/python-3.12.5/Include/internal/pycore_call.h:92 [inlined]
_PyObject_CallFunctionVa at /usr/local/src/conda/python-3.12.5/Objects/call.c:562 [inlined]
PyObject_CallFunction at /usr/local/src/conda/python-3.12.5/Objects/call.c:584
PyImport_Import at /usr/local/src/conda/python-3.12.5/Python/import.c:3048
PyImport_Import at /home/pharaldsson/.julia/dev/PythonCall/src/C/pointers.jl:303
unknown function (ip: 0x7f545273a904)
macro expansion at /home/pharaldsson/.julia/dev/PythonCall/src/Core/Py.jl:132 [inlined]
pyimport at /home/pharaldsson/.julia/dev/PythonCall/src/Core/builtins.jl:1561
pyimport at /home/pharaldsson/.julia/dev/PythonCall/src/Core/builtins.jl:1562
init_consts at /home/pharaldsson/.julia/dev/PythonCall/src/Core/consts.jl:205
__init__ at /home/pharaldsson/.julia/dev/PythonCall/src/Core/Core.jl:48
jl_apply at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/julia.h:2157 [inlined]
jl_module_run_initializer at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:76
run_module_init at ./loading.jl:1277
register_restored_modules at ./loading.jl:1255
_include_from_serialized at ./loading.jl:1199
_include_from_serialized at ./loading.jl:1156 [inlined]
#_require_search_from_serialized#1075 at ./loading.jl:1921
_require_search_from_serialized at ./loading.jl:1843
jfptr__require_search_from_serialized_44488.1 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
_require at ./loading.jl:2382
__require_prelocked at ./loading.jl:2247
jfptr___require_prelocked_69631.1 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/julia.h:2157 [inlined]
jl_f__call_in_world at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/builtins.c:894
#invoke_in_world#3 at ./essentials.jl:1088 [inlined]
invoke_in_world at ./essentials.jl:1085 [inlined]
_require_prelocked at ./loading.jl:2234
macro expansion at ./loading.jl:2173 [inlined]
macro expansion at ./lock.jl:273 [inlined]
__require at ./loading.jl:2130
jfptr___require_69567.1 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/julia.h:2157 [inlined]
jl_f__call_in_world at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/builtins.c:894
#invoke_in_world#3 at ./essentials.jl:1088 [inlined]
invoke_in_world at ./essentials.jl:1085 [inlined]
require at ./loading.jl:2123
jfptr_require_69564.1 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/julia.h:2157 [inlined]
call_require at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:486 [inlined]
eval_import_path at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:523
jl_toplevel_eval_flex at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:759
eval_body at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/interpreter.c:629
eval_body at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/interpreter.c:539
jl_interpret_toplevel_thunk at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/interpreter.c:821
jl_toplevel_eval_flex at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:943
jl_toplevel_eval_flex at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:886
ijl_toplevel_eval_in at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/toplevel.c:994
eval at ./boot.jl:430 [inlined]
eval_user_input at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPL.jl:226
repl_backend_loop at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPL.jl:323
#start_repl_backend#59 at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPL.jl:308
start_repl_backend at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPL.jl:305
#run_repl#72 at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPL.jl:464
run_repl at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPL.jl:450
jfptr_run_repl_11642 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/compiled/v1.11/REPL/u0gqU_5pcrL.so (unknown line)
#1137 at ./client.jl:441
jfptr_YY.1137_16382 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/compiled/v1.11/REPL/u0gqU_5pcrL.so (unknown line)
jl_apply at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/julia.h:2157 [inlined]
jl_f__call_latest at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/builtins.c:875
#invokelatest#2 at ./essentials.jl:1054 [inlined]
invokelatest at ./essentials.jl:1051 [inlined]
run_main_repl at ./client.jl:425
repl_main at ./client.jl:562 [inlined]
_start at ./client.jl:536
jfptr__start_71892.1 at /home/pharaldsson/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/julia.h:2157 [inlined]
true_main at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/jlapi.c:900
jl_repl_entrypoint at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/src/jlapi.c:1059
main at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/cli/loader_exe.c:58
unknown function (ip: 0x7f5469db5d8f)
__libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: 0x4010b8)
Allocations: 5894276 (Pool: 5892724; Big: 1552); GC: 7
Segmentation fault (core dumped)
pharaldsson@ryksugan:~$ The type `Int64` exists, but no method is defined for this combination of arg

[PallHaraldsson]

Also happens if I free (but Markdown change is maybe not off the hook, so feel free to close or comment if you think unrelated to rc3 as is):

$ julia +1.11
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.0-rc3 (2024-08-26)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.11) pkg> free PythonCall
   Resolving package versions...
    Updating `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] ~ PythonCall v0.9.23 `~/.julia/dev/PythonCall` ⇒ v0.9.23
    Updating `~/.julia/environments/v1.11/Manifest.toml`
  [6099a3de] ~ PythonCall v0.9.23 `~/.julia/dev/PythonCall` ⇒ v0.9.23
Precompiling project...
  1 dependency successfully precompiled in 19 seconds. 51 already precompiled.

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [6099a3de] PythonCall v0.9.23

julia> @time_imports using PythonCall
      8.8 ms  UnsafePointers
      1.3 ms  Printf
     76.7 ms  Dates
      0.3 ms  UUIDs
      1.7 ms  TOML
     22.1 ms  Preferences
      0.4 ms  PrecompileTools
               ┌ 0.0 ms Parsers.__init__() 
    439.7 ms  Parsers 88.77% compilation time
      0.7 ms  Mmap
      7.8 ms  StructTypes
     56.0 ms  JSON3
      0.4 ms  Pidfile
      1.3 ms  Base64
               ┌ 0.0 ms NetworkOptions.__init__() 
      3.5 ms  NetworkOptions
               ┌ 0.1 ms MbedTLS_jll.__init__() 
      4.0 ms  MbedTLS_jll
               ┌ 0.0 ms LibSSH2_jll.__init__() 
      3.7 ms  LibSSH2_jll
               ┌ 0.0 ms LibGit2_jll.__init__() 
      3.4 ms  LibGit2_jll
     15.2 ms  LibGit2
     16.6 ms  ArgTools
               ┌ 0.1 ms nghttp2_jll.__init__() 
      3.8 ms  nghttp2_jll
               ┌ 0.1 ms LibCURL_jll.__init__() 
      5.0 ms  LibCURL_jll
               ┌ 0.0 ms MozillaCACerts_jll.__init__() 
      4.2 ms  MozillaCACerts_jll
               ┌ 0.0 ms LibCURL.__init__() 
      1.5 ms  LibCURL
               ┌ 0.0 ms Downloads.Curl.__init__() 
     31.1 ms  Downloads
      1.2 ms  Tar
               ┌ 0.1 ms p7zip_jll.__init__() 
      5.5 ms  p7zip_jll
      0.2 ms  Logging
     18.1 ms  Markdown
               ┌ 0.0 ms Pkg.__init__() 
    409.8 ms  Pkg
      0.4 ms  Scratch
      0.2 ms  LazyArtifacts
      0.4 ms  JLLWrappers
               ┌ 5.6 ms micromamba_jll.__init__() 95.76% compilation time
      6.0 ms  micromamba_jll 88.81% compilation time
      0.4 ms  MicroMamba
               ┌ 251.1 ms CondaPkg.PkgREPL.__init__() 99.58% compilation time
    255.8 ms  CondaPkg 97.74% compilation time
               ┌ 0.0 ms Requires.__init__() 
      0.5 ms  Requires
     13.5 ms  MacroTools
      0.3 ms  DataValueInterfaces
      0.9 ms  DataAPI
      0.2 ms  IteratorInterfaceExtensions
      0.2 ms  TableTraits
      5.0 ms  OrderedCollections
     16.1 ms  Tables
      1.1 ms  Serialization
               ┌ 1873.9 ms PythonCall.C.__init__() 90.87% compilation time
               ├ 0.0 ms PythonCall.GC.__init__() 
               ├ 841.1 ms PythonCall.Core.__init__() 96.86% compilation time (86% recompilation)
               ├ 0.1 ms PythonCall.Convert.__init__() 
               ├ 0.0 ms PythonCall.Wrap.__init__() 
               ├ 0.0 ms PythonCall.JlWrap.Cjl.__init__() 
               ├ 235.9 ms PythonCall.JlWrap.__init__() 94.41% compilation time
               ├ 1.0 ms PythonCall.Compat.__init__() 
   3088.2 ms  PythonCall 88.73% compilation time (26% recompilation)

julia> 

(@v1.11) pkg> st
ERROR: MethodError: no method matching Int64(::Dates.DateTime)
The type `Int64` exists, but no method is defined for this combination of argument types when trying to construct it.

Closest candidates are:
  Int64(::Float64)
   @ Base float.jl:990
  Int64(::Float32)
   @ Base float.jl:990
  Int64(::Float16)
   @ Base float.jl:990
  ...

Stacktrace:
  [1] Dates.DateTime(y::Dates.DateTime, m::Int64, d::Int64, h::Int64, mi::Int64, s::Int64, ms::Int64, ampm::Dates.AMPM)
    @ Dates ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Dates/src/types.jl:421
  [2] (::Pkg.Types.var"#53#56"{String, String})(d::Dict{String, Any})
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:556
  [3] iterate
    @ ./generator.jl:48 [inlined]
  [4] _collect(c::Vector{Any}, itr::Base.Generator{Vector{Any}, Pkg.Types.var"#53#56"{String, String}}, ::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:800
  [5] collect_similar(cont::Vector{Any}, itr::Base.Generator{Vector{Any}, Pkg.Types.var"#53#56"{String, String}})
    @ Base ./array.jl:709
  [6] map(f::Function, A::Vector{Any})
    @ Base ./abstractarray.jl:3374
  [7] (::Pkg.Types.var"#52#55"{String, String, Dates.DateTime, String})()
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:554
  [8] mkpidlock(f::Pkg.Types.var"#52#55"{String, String, Dates.DateTime, String}, at::String, pid::Int32; kwopts::@Kwargs{stale_age::Int64})
    @ FileWatching.Pidfile ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:95
  [9] mkpidlock
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:92 [inlined]
 [10] mkpidlock
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:90 [inlined]
 [11] write_env_usage(source_file::String, usage_filepath::String)
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:537
 [12] Pkg.Types.EnvCache(env::Nothing)
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:375
 [13] EnvCache
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:354 [inlined]
 [14] Context
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:404 [inlined]
 [15] status(pkgs::Vector{Pkg.Types.PackageSpec}; io::IOContext{IO}, kwargs::@Kwargs{})
    @ Pkg.API ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/API.jl:150
 [16] status(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/API.jl:148
 [17] do_cmd(command::Pkg.REPLMode.Command, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/REPLMode/REPLMode.jl:407
 [18] do_cmds(commands::Vector{Pkg.REPLMode.Command}, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/REPLMode/REPLMode.jl:393
 [19] do_cmds(repl::REPL.LineEditREPL, commands::String)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:92
 [20] on_done(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool, repl::REPL.LineEditREPL)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:106
 [21] #invokelatest#2
    @ ./essentials.jl:1054 [inlined]
 [22] invokelatest
    @ ./essentials.jl:1051 [inlined]
 [23] (::REPLExt.var"#47#50"{REPL.LineEditREPL})(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:128
 [24] #invokelatest#2
    @ ./essentials.jl:1054 [inlined]
 [25] invokelatest
    @ ./essentials.jl:1051 [inlined]
 [26] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2749
 [27] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1456
 [28] (::REPL.var"#75#81"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:461

(@v1.11) pkg> thethethe

I don't believe I wrote that "thethethe", i.e. it just happened. But I'm not sure with the incomplete last line in the shell from the middle comment, I likely just pasted stuff then in by accident "The type Int64 exists, but no method is defined for this combination of arg", and it's unrelated to Julia since now in bash history.

[PallHaraldsson]

This doesn't happen in rc2, so I likely messed up rc3 with my Markdown change. Even if I undo that change of rc3, or try...,, it doesn't seem to take, i.e. I still get the error. I guess the Markdown precompile statements can't be undone? Precompilation is triggered when I added them, and I think should happen each time there's a change, but I'm using a stale pkgimage? Why isn't it updated if I change the source?

[PallHaraldsson]

@cdoris, are you doing something unusual in CondaPkg, with Julia's internals? You change Pkg, or the REPL mode, not sure if it's disallowed, or not guaranteed to work in later Julia versions.

Note this works in my rc2 (where I've not changed Markdown). Also in rc3 works with Markdown alone (that I changed and may not have undone the right way, so can someone reproduce this error with an unchanged rc3), but not with otherwise unchanged CondaPkg:

$ julia +1.11
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.0-rc3 (2024-08-26)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [992eb4ea] CondaPkg v0.2.23
  [6099a3de] PythonCall v0.9.23

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [992eb4ea] CondaPkg v0.2.23
  [6099a3de] PythonCall v0.9.23

julia> using Markdown

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [992eb4ea] CondaPkg v0.2.23
  [6099a3de] PythonCall v0.9.23

(@v1.11) pkg> st
Status `~/.julia/environments/v1.11/Project.toml`
  [992eb4ea] CondaPkg v0.2.23
  [6099a3de] PythonCall v0.9.23

julia> using CondaPkg

(@v1.11) pkg> st
ERROR: MethodError: no method matching Int64(::Dates.DateTime)
The type `Int64` exists, but no method is defined for this combination of argument types when trying to construct it.

Closest candidates are:
  Int64(::Float64)
   @ Base float.jl:990
  Int64(::Float32)
   @ Base float.jl:990
  Int64(::Float16)
   @ Base float.jl:990
  ...

Stacktrace:
  [1] Dates.DateTime(y::Dates.DateTime, m::Int64, d::Int64, h::Int64, mi::Int64, s::Int64, ms::Int64, ampm::Dates.AMPM)
    @ Dates ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Dates/src/types.jl:421
  [2] (::Pkg.Types.var"#53#56"{String, String})(d::Dict{String, Any})
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:556
  [3] iterate
    @ ./generator.jl:48 [inlined]
  [4] _collect(c::Vector{Any}, itr::Base.Generator{Vector{Any}, Pkg.Types.var"#53#56"{String, String}}, ::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:800
  [5] collect_similar(cont::Vector{Any}, itr::Base.Generator{Vector{Any}, Pkg.Types.var"#53#56"{String, String}})
    @ Base ./array.jl:709
  [6] map(f::Function, A::Vector{Any})
    @ Base ./abstractarray.jl:3374
  [7] (::Pkg.Types.var"#52#55"{String, String, Dates.DateTime, String})()
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:554
  [8] mkpidlock(f::Pkg.Types.var"#52#55"{String, String, Dates.DateTime, String}, at::String, pid::Int32; kwopts::@Kwargs{stale_age::Int64})
    @ FileWatching.Pidfile ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:95
  [9] mkpidlock
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:92 [inlined]
 [10] mkpidlock
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/FileWatching/src/pidfile.jl:90 [inlined]
 [11] write_env_usage(source_file::String, usage_filepath::String)
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:537
 [12] Pkg.Types.EnvCache(env::Nothing)
    @ Pkg.Types ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:375
 [13] EnvCache
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:354 [inlined]
 [14] Context
    @ ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/Types.jl:404 [inlined]
 [15] status(pkgs::Vector{Pkg.Types.PackageSpec}; io::IOContext{IO}, kwargs::@Kwargs{})
    @ Pkg.API ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/API.jl:150
 [16] status(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/API.jl:148
 [17] do_cmd(command::Pkg.REPLMode.Command, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/REPLMode/REPLMode.jl:407
 [18] do_cmds(commands::Vector{Pkg.REPLMode.Command}, io::Base.TTY)
    @ Pkg.REPLMode ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/src/REPLMode/REPLMode.jl:393
 [19] do_cmds(repl::REPL.LineEditREPL, commands::String)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:92
 [20] on_done(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool, repl::REPL.LineEditREPL)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:106
 [21] #invokelatest#2
    @ ./essentials.jl:1054 [inlined]
 [22] invokelatest
    @ ./essentials.jl:1051 [inlined]
 [23] (::REPLExt.var"#47#50"{REPL.LineEditREPL})(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
    @ REPLExt ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Pkg/ext/REPLExt/REPLExt.jl:128
 [24] #invokelatest#2
    @ ./essentials.jl:1054 [inlined]
 [25] invokelatest
    @ ./essentials.jl:1051 [inlined]
 [26] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2749
 [27] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1456
 [28] (::REPL.var"#75#81"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:461

[IanButterworth]

I think this is a TOML issue.
I suspect for some reason we stop hitting this method
https://github.com/JuliaLang/julia/blob/1463c9991c4a75730e4d6822313180ca323241c0/stdlib/Dates/src/types.jl#L499
and fall back to the generic Dates.DateTime(y::Any, m::Int64, ...) method.

Could Pkg being loaded via require_stdlib mean that when PythonCall is loaded a different TOML gets loaded?

(@v1.12) pkg> st
Status `~/.julia/environments/v1.12/Project.toml`
  [6099a3de] PythonCall v0.9.23

(@v1.12) pkg> why TOML
  PythonCall → CondaPkg → JSON3 → Parsers → PrecompileTools → Preferences → TOML
  PythonCall → CondaPkg → JSON3 → PrecompileTools → Preferences → TOML
  PythonCall → CondaPkg → MicroMamba → Pkg → TOML
  PythonCall → CondaPkg → MicroMamba → micromamba_jll → JLLWrappers → Preferences → TOML
  PythonCall → CondaPkg → MicroMamba → micromamba_jll → LazyArtifacts → Pkg → TOML
  PythonCall → CondaPkg → Pkg → TOML
  PythonCall → CondaPkg → Preferences → TOML
  PythonCall → CondaPkg → TOML
  PythonCall → Pkg → TOML

@topolarity given you worked on some of the TOML stuff here.
@vtjnash for the require_stdlib behavior.

[vtjnash]

yes, you can have any number of different TOML packages loaded, and unless you depend specifically upon a TOML package, you should not assume anything about it being present

[IanButterworth]

Ok. I've not followed the recent TOML changes in Pkg so I defer to @topolarity I think?

[topolarity]

Pkg does depend on both TOML and Dates, and makes sure to load the Dates-enabled TOML parser always. I'm a bit skeptical that we changed anything there - I think it's always been that way.

We read d["time"] in the TOML dict and get a Dates.DateTime and then pass that to Dates.DateTime(d["time"])

As far as I can tell that's actually supposed to be hitting https://github.com/JuliaLang/julia/blob/1463c9991c4a75730e4d6822313180ca323241c0/stdlib/Dates/src/conversions.jl#L20

I'm not sure why it's not hitting that method - that doesn't seem related to TOML to me.

[KristofferC]

My guess is that there must be two Dates packages loaded and in

  [1] Dates.DateTime(y::Dates.DateTime, m::Int64, d::Int64, h::Int64, mi::Int64, s::Int64, ms::Int64, ampm::Dates.AMPM)
    @ Dates ~/.julia/juliaup/julia-1.11.0-rc3+0.x64.linux.gnu/share/julia/stdlib/v1.11/Dates/src/types.jl:421

the first Dates and the second Dates are actually different modules?

[topolarity]

Oh my - so TOML.Dates !== Pkg.Dates and then TOML.parsefile and Pkg.parse_toml return incompatible types

[topolarity]

That seems terribly broken to me.

How is Julia allowed to break the identity of a common dependency like that?

[KristofferC]

I haven't confirmed my suspicion but that is the only way I can imagine hitting that dispatch...

[vtjnash]

It is permitted, but only in certain configurations (e.g. where there is no dependencies between them, but only an assumption it will exist because of some transitive assumption of being in the other's project files)

[topolarity]

Is that defined precisely somewhere?

It's not clear to me whether that would include this situation or not...