Consider Enums when checking for duplicate dictionary keys

[jaydesl]

Type of Changes

	Type
✓	🐛 Bug fix
	✨ New feature
	🔨 Refactoring
	📜 Docs

Description

Will properly emit W0109: Duplicate key if Enum members are reused.

Closes #5150

[coveralls]

Pull Request Test Coverage Report for Build 1348666598

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 93.219%

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Totals
Change from base Build 1347128151:	0.001%
Covered Lines:	13596
Relevant Lines:	14585

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💛 - Coveralls

[Pierre-Sassoulas]

Looks good, thank you ! Could you add the example from the issue in the functional tests in tests/functional/ ? You need to add the expected message inside the code with # [expected-message]'s comments.

[jaydesl]

Thanks Pierre! Think it should be good to go now :)

[Pierre-Sassoulas]

👍 ! Great first contribution, welcome to the project :)