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In Scala or OCaml you get a compile-time warning + runtime error. In Java 14, Kotlin and Rust there is a compile-time error if switch/match expression is non-e

In Scala or OCaml you get a compile-time warning + runtime error. In Java 14, Kotlin and Rust there is a compile-time error if switch/match expression is non-exhaustive.

lmm 6y ago
You don't get a compile-time warning in Scala, only a runtime error. https://scastie.scala-lang.org/6fGnDSzDSdmI4USN5k9OTA https://scastie.scala-lang.org/6fGnDSzDSdmI4USN5k9OTA
- pkolaczk 6y ago
  If you're matching on a sealed type, you do get a warning.
  - lmm 6y ago
    Right - like I said, if it's "closed" you get a warning, but if it's "open" it's silently accepted and fails at runtime.
    - pkolaczk 6y ago
      The openness of match/switch over a sealed hierarchy is in another dimension - you can add more switches without changing old code. This is something that interfaces don't provide.
      - lmm 6y ago
        Visitor-style interfaces do provide that flexibility, though they're cumbersome.