fix: allow `bind:this` with dynamic type on inputs (#9713)

fixes #9709

.changeset/great-icons-retire.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: allow `bind:this` with dynamic type on inputs

packages/svelte/src/compiler/phases/2-analyze/validation.js

@@ -323,7 +323,7 @@ export const validation = {
 					);
 				}
 
-				if (parent.name === 'input') {
+				if (parent.name === 'input' && node.name !== 'this') {
 					const type = /** @type {import('#compiler').Attribute | undefined} */ (
 						parent.attributes.find((a) => a.type === 'Attribute' && a.name === 'type')
 					);

packages/svelte/tests/validator/samples/binding-this-input-type-dynamic/errors.json

@@ -0,0 +1 @@
+[]

packages/svelte/tests/validator/samples/binding-this-input-type-dynamic/input.svelte

@@ -0,0 +1,6 @@
+<script>
+	let foo;
+	let inputType;
+</script>
+
+<input bind:this={foo} type={inputType}>