Function "find" doesn't work

[OdoctorG]

The builtin function "find" doesnt seem to work, atleast not in the try brat online editor.

Code:
"amogus".find "gus"

Ouput:

/home/brat/brat/core/core.lua:2184: attempt to call upvalue 'block' (a table value)
stack traceback:
/home/brat/brat/core/core.lua: in function 'block'
/home/brat/brat/core/core.lua:4440: in function 'each'
/home/brat/brat/core/core.lua:2189: in function '_m__temp1_find'
[string "string"]:41: in function '_m__temp3_run_underparsed'
[string "string"]:209: in function <[string "string"]:12>
stack traceback:
[string "string"]:336: in main chunk
[C]: in function 'xpcall'
/home/brat/brat/core/core.lua:1304: in function 'protect'
/home/brat/brat/bin/brat:137: in function 'run_string'
/home/brat/brat/bin/brat:162: in main chunk
[C]: at 0x5650922ed5b0

Interestingly .include? works but not find

[presidentbeef]

So... string.find has apparently never matched the documentation (the code is 8-9 years old). It's actually called find_first. You can see the mismatch here: https://github.com/presidentbeef/brat/blob/main/core/core.lua#L4910-L4924

string.find is from enumerable.find which takes a function as an argument: https://github.com/presidentbeef/brat/blob/main/core/core.lua#L2176-L2196

And apparently that isn't documented, either! 😆