Make enum type compatible with union of all enum item literals #10388
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For example, consider this enum:
```
class E(Enum):
A = 1
B = 1
```
This PR makes `E` compatible with `Literal[E.A, E.B]`.
Also fix mutation of the argument list in
`try_contracting_literals_in_union`.
This fixes some regressions introduced in #9097.
ilevkivskyi
approved these changes
Apr 30, 2021
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For example, consider this enum:
This PR makes
Ecompatible withLiteral[E.A, E.B].Also fix mutation of the argument list in
try_contracting_literals_in_union.This fixes some regressions introduced in #9097.