[eropple]

I don't think there's stigma around Haskell, aside from maybe complexity. I think there often is around Haskell programmers; there's a rep for jerkishness. (Both are commonly attributed to Scala as well, though I think, as a Scala person, the rep for jerkishness is much more earned in Scala-land.)

[seanmcdirmid]

Scala is another one of those languages whose type information should enable a really good advanced experience, but the IDEs are struggling with respect to their peers (heroic efforts from jet brains and type safe not with standing). As parent said, many communities really don't appreciate or understand IDEs, and so what gets done reflects that.

[justthistime_]

Which languages have better IDE support than Scala?

Java, C# ... and both received probably hundred times more man-power than Scala IDEs.

What else?

My experience: All dynamic languages – probably not. C++? Hell no. F#? No. OCaml? No. Haskell? No.

Which language do you think of?

[seanmcdirmid]

F# has pretty good IDE support, and type providers are really nice as code completion extensions. C++ has excellent IDE support in visual studio, note I'm including the debugger here also, as that is part of the experience!

Then there is objective C, Swift, Kotlin, Dart, Typescript, some versions of smalltalk. Many of those languages were designed specifically for IDE use (dart and typescript definitely).