Why can’t I call `Either.catch()` from inside `Eit...

# arrow

[EarthCitizen]

Why can’t I call Either.catch() from inside Either.fx { }? …I see an error about restricted suspending functions, but I don’t understand how to see what can be called from within Either.fx { } …I am currently getting around the problem by doing this, but I don’t know if it is safe to do:

fun <L, R> Either.Companion.catchSafely(
    mapper: (Throwable) -> L,
    block: () -> R): Either<L, R> =
    runBlocking {
        catch(
            suspend  { block() }
        )
    }.mapLeft(mapper)

[raulraja]

You can by flagging thew containing function as suspend

[raulraja]

all side effects in Arrow need to be suspend and Either.catch deals with arised exceptions.

[raulraja]

Without it being it suspend it can’t be guaranteed it’s pure.

[EarthCitizen]

OK, thanks