Using function in IF condition statement fails on 3.16.4 if <svelte:self> is present

[goosechaser]

Describe the bug

This following condition will fail on 3.16.4 (works on earlier versions)

{#if foo && someFunction(foo)}
    <svelte:self />
{/if}

To Reproduce
Broken: REPL
Working: REPL

Severity
Blocking an upgrade. I use recursion a lot in my application.

Additional context
According to @halfnelson on Discord:

function select_block_type(ctx, dirty) {
    if (dirty[0] & /*data*/ 1) show_if = !!(/*datum*/ ctx[1].foo && a(func));
    if (show_if) return 0;
    return 1;
}

1 being passed for "dirty"
then dirty[0] being called
the rest of the changes in output code are all the same, dirty & 1 becoming dirty[0] & 1

[ghost]

I will try this code with #4102 applied and see if it makes a difference. We lost destructuring as a result of trying to fix some other update cases... maybe it also had the side effect of messing this up.

EDIT: Confirmed fixed if #4102 is merged.

[dekdevy]

Getting the same issue. Does not seem to be related to <svelte:self /> for me. No Repl, but maybe it helps.

{#if $a && $a.b.c=== 'test'}
          {#if $a.d.e()}
            <SomeComponent/>
          {:else}
            <span>This branch is always reached, even if the condition should resolve as true</span>
          {/if}
{:else}
        <span></span>
 {/if}

[ghost]

@dekdevy,

Thanks, here's a simplified version that still fails:
https://svelte.dev/repl/5bb3f6c7f50c401abbfc6c0f70038884?version=3.16.4

I'll make a test for it and see if the PR fixes it.
This case is also fixed by the referenced PR.

Check the mentioned issue for another case where it fails.

[Conduitry]

Fixed in v3.16.5 - https://svelte.dev/repl/8fcdf054dd33437fa415b7b2af109477?version=3.16.5