(FunC) Identifiers can't contain [ or ], and variable names cannot start with ~ or .

[novusnota]

Is your feature request related to a problem? Please describe.

There's an incomplete description here: https://docs.ton.org/develop/func/literals_identifiers#identifiers

Describe the solution you'd like

Clarify, that identifiers can't contain [ or ] (because otherwise they'll be parsed as tuples), and variable names cannot start with ~ or .

Also, one cannot declare a new variable or function with the name from the list of builtins: https://docs.ton.org/develop/func/builtins (C++ source link)

Additional context

No response