Wrong format result with when guards

[revonateB0T]

Original

when (true) {
    true if when (true) {
        true -> true
        false -> false
    } -> true
    else -> false
}

After formatting

when (true) {
    true if when (true) {
        true -> true
        false -> false
    },
    -> true
    else -> false
}

Which is illegal

[paul-dingemans]

For now you can work around this as follows:

@Suppress("ktlint:standard:trailing-comma-on-declaration-site")
when (true) {
    true if when (true) {
        true -> true
        false -> false
    } -> true
    else -> false
}

[paul-dingemans]

The problem seems to occur only when the guard clause is a multiline expression.

Code below reproduces the error:

val x2 =
    when (true) {
        true if foo(
            "a",
        )
        -> true

        else -> false
    }

while code below does not reproduce:

val x3 =
    when (true) {
        true if foo("a") -> true
        else -> false
    }