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Can be reproduced with a script like this:
-- in some lua file
vim.fn.timer_start(10, function() error("uh....") end)
-- will cause neovim to crash with the following error.
PANIC: unprotected error in call to Lua API
(nlua_CFunction_func_call failed.)
After this, it will instead print the error message
from the top of the stack, like so.
tmp/error_nvim.lua:10: uh...
Also added an example test. Previously this test
caused the embedded nvim to panic.