No errors when number and function data after keyword `in`

[Withered-Flower-0422]

]for i in 42; end for
]for i in @print; end for
]for i in (null + 0); end for
]

There should be errors, like how null does:

]for i in null
Compiler Error: sequence expression expected for 'for' loop [line 1]
]

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