Bugfix for underscore dot lambda: Forbidding expressions not based on the implied _ arg #16207
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Addresses #16136 .
Although some of them look interesting, they should not be a hidden part of this feature, and all of them will now report an error:
This used to work in the release candidate by mistake, and will be a hard error.
(explanation: Those were all expressions, which did not make use of the implied argument to the lambda.
It produced a lambda function working on any kind of generic argument 'a, which always returned the same constant value)