Proposal: allow '?' and '!' in identifiers

[Erik Max Francis]

jcm wrote:

> I understand that you dislike the idea of allowing '?' in identifiers.
> But it would not necessarily require "all sorts of weird parser
> logic".  I expect it's a simple change to the lexer.  I haven't looked
> at the Python codebase, so I don't know for sure.  But I've written
> enough lexers and parsers to know what should be easy or difficult.

Sorry, I was comingling your requests for both '?' and '!' in
identifiers.  It was '!' that would have required ambiguity checks, not
'?'.

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