Are there examples of significant enhancements to major programming languages that were fully released and then found to be sufficiently flawed that they had to be withdrawn?
UPD @Jeff Foster has an example of a feature that is not consistently implemented and I’d take those as answers
UPD There is a grey area between Deprecated and withdrawn. I suspect that there are thousands of Deprecated examples – which can still be used but are not advised. I can conceive that there are features which some creators thought they could implement fully or consistently but actually broke the integrity of the system.
I was particularly looking for enhancements (not original features) as these will have been planned (probably with community involvement) and released after testing, etc.
There don’t seem to be any clear examples.