The content of else part in each block repeats

[zwz]

You can reproduce it by following these steps:

1. start with sapper-template#rollup

2. modify the file routes/index.svelte as:

   <script>
   let array = []
   </script>
   {#each array as elem}
   item
   {:else}
   weird
   {/each}
   

   Until now everything works fine. You will see one "weird" on the page.

3. remove the file routes/_layout.svelte

   After refreshing the page (manually), you will see two "weird"s!

4. if you append something to the file routes/index.svelte, make it like

   <script>
   let array = []
   </script>
   {#each array as elem}
   item
   {:else}
   weird
   {/each}
   blah blah ...
   

   then everything just works fine again.

[zwz]

repeated-else-issue.zip

This is a demo project.
Just download and extract it, run npm install && npm run dev.

I have been struggling with it for a few days.
Hope somebody could confirm it is a bug or help me out.

[zwz]

I made an online demo for this issue at https://codesandbox.io/s/sapper-minimal-blns7
You will see an extra weird appears above Hello World once you refresh.

[Conduitry]

This seems to be an issue with hydration. Moving to Svelte repo.

[vipero07]

This doesn't seem to happen in the svelte repl with 3.16.7 or 3.4.1 the version of svelte used in the codesandbox example.

Pretty certain this has to do with removing _layout.svelte in sapper.

[Conduitry]

Hydration of {#each} {:else} should be fixed in 3.17.0.