chore: improve error message for undeclared enum member

[tserg]

What I did

Fix #3262

How I did it

Set EnumT._helper._id to the same name as the EnumT.

How to verify it

See test.

Commit message

chore: improve error message for undeclared enum member

Description for the changelog

Improve error message for undeclared enum member

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[codecov-commenter]

Codecov Report

Merging #3264 (e570464) into master (02339df) will decrease coverage by 0.29%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #3264      +/-   ##
==========================================
- Coverage   88.88%   88.60%   -0.29%     
==========================================
  Files          84       84              
  Lines       10598    10599       +1     
  Branches     2212     2212              
==========================================
- Hits         9420     9391      -29     
- Misses        769      796      +27     
- Partials      409      412       +3     

Impacted Files	Coverage Δ
vyper/semantics/types/user.py	85.62% <100.00%> (+0.04%)	⬆️
vyper/codegen/arithmetic.py	79.61% <0.00%> (-5.10%)	⬇️
vyper/builtins/functions.py	88.63% <0.00%> (-1.80%)	⬇️

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[fubuloubu]

Seems a bit funky, basically a side effect?

[tserg]

Yes, so that it can be handled by L300 here:

vyper/vyper/semantics/types/base.py

Lines 291 to 303 in 02339df

	def get_member(self, key: str, node: vy_ast.VyperNode) -> "VyperType":
	if key in self.members:
	return self.members[key]
	# special error message for types with no members
	if not self.members:
	raise StructureException(f"{self} instance does not have members", node)
	suggestions_str = get_levenshtein_error_suggestions(key, self.members, 0.3)
	raise UnknownAttribute(f"{self} has no member '{key}'. {suggestions_str}", node)
	def __repr__(self):
	return self._id