How to upper case a experssion in declarative marco?

help
1

I want to upper case some experssion $x (or do any other process on it).
How to write this?

And where is the sheet of the suffixes? (like ident, expr for $x)

Thank you

2

I don't think it's possible to do lexical transformations like uppercase.

The designators are listed here: Macros By Example - The Rust Reference

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