OhMyREPL sysimage breaks VScode language server

[Crown421]

I am running julia 1.5-rc on Manjaro Linux and replaced my default sysimage with one including Revise and OhMyREPL. This was very nice, and Julia sessions started up very quickly.

Unfortunately, with this sysimage the VScode Julia Language Server doesn't start, with the following error

Warning: Package OhMyREPL does not have REPL in its dependencies:
│ - If you have OhMyREPL checked out for development and have
│   added REPL as a dependency but haven't updated your primary
│   environment's manifest file, try `Pkg.resolve()`.
│ - Otherwise you may need to report an issue with OhMyREPL
└ Loading REPL into OhMyREPL from project dependency, future warnings for OhMyREPL are suppressed.
fatal: error thrown and no exception handler available.
#<null>
require at ./loading.jl:906
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2214 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2398
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1690 [inlined]
call_require at /buildworker/worker/package_linux64/build/src/toplevel.c:425 [inlined]
eval_import_path at /buildworker/worker/package_linux64/build/src/toplevel.c:462
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:682
jl_parse_eval_all at /buildworker/worker/package_linux64/build/src/ast.c:913
jl_load_rewrite at /buildworker/worker/package_linux64/build/src/toplevel.c:914
include at ./Base.jl:380
include at ./Base.jl:368 [inlined]
include at /home/steffen/.julia/packages/OhMyREPL/7qVFi/src/OhMyREPL.jl:6 [inlined]
__init__ at /home/steffen/.julia/packages/OhMyREPL/7qVFi/src/OhMyREPL.jl:122
jfptr___init___32261 at /home/steffen/Apps/julia-1.5.0-rc2/lib/julia/sys.so (unknown line)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2214 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2398
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1690 [inlined]
jl_module_run_initializer at /buildworker/worker/package_linux64/build/src/toplevel.c:74
_julia_init at /buildworker/worker/package_linux64/build/src/init.c:779
main at /buildworker/worker/package_linux64/build/ui/repl.c:221
__libc_start_main at /usr/lib/libc.so.6 (unknown line)
_start at /home/steffen/Apps/julia-1.5.0-rc2/bin/julia (unknown line)
[Info  - 17:04:13] Connection to server got closed. Server will restart.

Reverting to the default sysimage allows the language server to start again. I then rebuild the system image, once with a precompile log file, and once without, and in both cases the error above returned.

[mkitti]

This seems like a VSCode language server issue rather than a package compiler issue. I wonder if you could narrow this down further. If you only create a sysimage with either Revise or OhMyREPL (not both), does the problem still occur?

[KristofferC]

In general, it is not such a good idea to replace the default sysimage. Better to just start julia with an explicit sysimage using the --sysimage option.

[KristofferC]

replace_default is not recommended and will probably get removed (#546). Since issues with it are known, I'll close this.