Regarding Identifier, in my page the diagram shows it must start with a Letter optionally followed by any Letter or Digit. Letter links to another diagram defining it as any of A-Z a-z _
This seems correct. I just tested and "const _ = 1" compiles fine using a lone _ as an identifier. Try left clicking Letter in the following diagram: https://www.getlazarus.org/learn/language/lexical/#identifier
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