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$ lua
Lua 5.3.4  Copyright (C) 1994-2017, PUC-Rio
> foo=1print(foo)
> a=1f()
stdin:1: malformed number near '1f'
> a=1g()
stdin:1: attempt to call a nil value (global 'g')
stack traceback:
    stdin:1: in main chunk
    [C]: in ?

This seems to exist since the introduction of hex literals (Lua 5.2). Not sure of the exact revision.