Has there ever been a new feature added to a language long after 1.0, which was later removed because of unforeseen problems?

This page summarizes the projects mentioned and recommended in the original post on /r/ProgrammingLanguages
Dhall configuration-language

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  • ghc-proposals

    Proposed compiler and language changes for GHC and GHC/Haskell

    • GHC recently removed Co/Contravariance of function types, Deep skolemisation and Deep instantiation https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0287-simplify-subsumption.rst (yes, GHC is technically not a language, but might as well be)

  • dhall-lang

    Maintainable configuration files

    • The configuration language Dhall used to have a rule Sort ~> Kind, but this lead to issues due to Hurken's paradox https://github.com/dhall-lang/dhall-lang/issues/250

  • InfluxDB

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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