Weird moonscript bug

example.moon

moonscript = require "moonscript"

moonscript.loadstring('print "\\nHere I am!"', 'string', 't', setmetatable({}, {
	__index: (key) =>
		print "index", key
		for key, value in pairs debug.getinfo 2
			print '', key, value
		print debug.traceback()
}))()

output

index	scope
	currentline	706
	nparams	2
	name	tree
	lastlinedefined	731
	isvararg	false
	short_src	/usr/local/share/lua/5.3/moonscript/compile.lua
	namewhat	field
	func	function: 0xeb16e0
	istailcall	false
	linedefined	701
	source	@/usr/local/share/lua/5.3/moonscript/compile.lua
	nups	5
	what	Lua
stack traceback:
	wtf.moon:8: in metamethod '__index'
	/usr/local/share/lua/5.3/moonscript/compile.lua:706: in function 'moonscript.compile.tree'
	/usr/local/share/lua/5.3/moonscript/base.lua:60: in function 'moonscript.to_lua'
	/usr/local/share/lua/5.3/moonscript/base.lua:90: in function 'moonscript.loadstring'
	wtf.moon:2: in upvalue 'moonscript_chunk'
	...local/lib/luarocks/rocks-5.3/moonscript/0.5.0-1/bin/moon:86: in function <...local/lib/luarocks/rocks-5.3/moonscript/0.5.0-1/bin/moon:84>
	[C]: in function 'xpcall'
	...local/lib/luarocks/rocks-5.3/moonscript/0.5.0-1/bin/moon:99: in function <...local/lib/luarocks/rocks-5.3/moonscript/0.5.0-1/bin/moon:47>
	(...tail calls...)
	[C]: in ?
index	implicitly_return_root
	currentline	627
	nparams	2
	lastlinedefined	631
	isvararg	false
	short_src	/usr/local/share/lua/5.3/moonscript/compile.lua
	namewhat	
	func	function: 0xeb1240
	istailcall	true
	linedefined	626
	source	@/usr/local/share/lua/5.3/moonscript/compile.lua
	nups	1
	what	Lua
stack traceback:
	wtf.moon:8: in metamethod '__index'
	/usr/local/share/lua/5.3/moonscript/compile.lua:627: in function </usr/local/share/lua/5.3/moonscript/compile.lua:626>
	(...tail calls...)

Here I am!