Svelte 5: Snippets incorrectly sharing scope inside component slots

[Not-Jayden]

Describe the bug

When declaring snippets with the same name inside separate component slots, you get a compiler error for '<name>' has already been declared, even though they shouldn't be sharing the same scope.

e.g.

<script>
	import Box from './Box.svelte';
</script>

<Box>
	{#snippet children()}
		Hello
	{/snippet}
</Box>

<Box>
	{#snippet children()}
		World
	{/snippet}
</Box>

The second children snippet gives an error of 'children' has already been declared, even though each snippet should have their own respective scope.

Workaround for now is creating the snippet with a different name, and passing it as a prop to the component.

e.g.

<Box>
	{#snippet children()}
		Hello
	{/snippet}
</Box>

<Box children={children2}>
	{#snippet children2()}
		World
	{/snippet}
</Box>

Reproduction

Reproduction

Logs

index-a870eda6.js:83 CompileError: 'children' has already been declared
    at ar (compiler.cjs@5.0.0-next.17:1:228250)
    at Ys.declare (compiler.cjs@5.0.0-next.17:1:301114)
    at SnippetBlock (compiler.cjs@5.0.0-next.17:1:306484)
    at e (compiler.cjs@5.0.0-next.17:1:112918)
    at visit (compiler.cjs@5.0.0-next.17:1:112780)
    at Component (compiler.cjs@5.0.0-next.17:1:303836)
    at e (compiler.cjs@5.0.0-next.17:1:112918)
    at eval (compiler.cjs@5.0.0-next.17:1:112560)
    at Array.forEach (<anonymous>)
    at Object.next (compiler.cjs@5.0.0-next.17:1:112509)

System Info

REPL Chrome

Severity

annoyance

[mimbrown]

The compiled output should just be able to change from:

function children(...)

to

const children = function(...)

and the scoping will work properly.

[mimbrown]

Another entry in the books for "legacy JS hoisting rules are annoying"