How to determine if a string is a valid rust identifier?
I feel like there might be a function in the standard library to do this somewhere?
Identifiers are described here in terms of the Unicode XID_start and XID_continue properties. You could implement the rules described there very easily using the unicode_xid crate.
For a less manual approach, you could use syn::parse_str::<syn::Ident> as recommended by the proc-macro2 documentation.
But I have to ask: why do you want to do this?
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Yeah it's debatable. I think the argument is that I can give a better error message than the compiler would otherwise when it gets used in the code gen.
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