Crash when using arrow functions in {@const}

[TheOnlyTails]

Describe the bug

When creating a markup variable with {@const}, whose value uses an arrow function in some way (for example, finding an item in an array), Svelte will fail with the error:

func is not defined

Reproduction

https://svelte.dev/repl/77bcccb636f64213ab20c666a870ed96

Logs

Uncaught (in promise) ReferenceError: func is not defined
    at get_each_context_3 (FeatureShowcase.svelte:210:34)
    at Array.create_if_block_13 (FeatureShowcase.svelte:209:11)
    at Object.update [as p] (FeatureShowcase.svelte:242:24)
    at update (index.mjs:1085:36)
    at flush (index.mjs:1052:13)

System Info

the command failed, but here's my system info:
- OS: Latest Windows 11 Insider build (22533.1001) in the Dev channel
- node v17.3.0
- npm v7.20.6
- Browser - Microsoft Edge 97.0.1072.55 (latest)
- Svelte 3.46.1
- SvelteKit 1.0.0-next.229

Severity

blocking an upgrade

[rohitf]

@TheOnlyTails This is tangential, but you can also implement the functionality in that each block like so

{#each tags as {color}}
	<p>{color}</p>
{/each}

[TheOnlyTails]

@TheOnlyTails This is tangential, but you can also implement the functionality in that each block like so

@rohitf I'm aware, this is just a demonstration.