parsing failure if file contains the word "goto"

[fiendish]

/usr/local/opt/lua@5.1/bin/lua5.1: ...luarocks/share/lua/5.1/metalua/grammar/generator.lua:176: line 1506, char 8: Identifier expected
>>> function goto(uid)
>>>         ^
stack traceback:
	[C]: in function 'error'
	...luarocks/share/lua/5.1/metalua/grammar/generator.lua:176: in function 'parse_error'
	...rocks/share/lua/5.1/metalua/compiler/parser/misc.lua:96: in function <...rocks/share/lua/5.1/metalua/compiler/parser/misc.lua:95>
	(tail call): ?
	...luarocks/share/lua/5.1/metalua/grammar/generator.lua:607: in function <...luarocks/share/lua/5.1/metalua/grammar/generator.lua:591>
	(tail call): ?
	...luarocks/share/lua/5.1/metalua/grammar/generator.lua:113: in function 'raw_parse_sequence'
	...luarocks/share/lua/5.1/metalua/grammar/generator.lua:216: in function <...luarocks/share/lua/5.1/metalua/grammar/generator.lua:212>
	(tail call): ?
	(tail call): ?
	...
	...rocks/share/lua/5.1/metalua/compiler/parser/misc.lua:164: in function 'e'
	...luarocks/share/lua/5.1/metalua/grammar/generator.lua:113: in function 'raw_parse_sequence'
	...luarocks/share/lua/5.1/metalua/grammar/generator.lua:216: in function <...luarocks/share/lua/5.1/metalua/grammar/generator.lua:212>
	(tail call): ?
	...kelmana/.luarocks/share/lua/5.1/metalua/compiler.lua:104: in function 'f'
	...kelmana/.luarocks/share/lua/5.1/metalua/compiler.lua:153: in function 'src_to_ast'
	/Users/kelmana/.luarocks/share/lua/5.1/formatter.lua:367: in function 'getindentlevel'
	/Users/kelmana/.luarocks/share/lua/5.1/formatter.lua:512: in function 'indentcode'
	...uarocks/rocks-5.1/formatter/0.1.1-1/bin/luaformatter:79: in main chunk
	[C]: ?