revert duplicate prop name validation (valid use cases exist)

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

@@ -422,7 +422,6 @@ export function analyze_component(root, options) {
 				options,
 				ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
 				parent_element: null,
-				all_prop_names: new Set(),
 				has_props_rune: [false, false],
 				component_slots: new Set(),
 				expression: null,
@@ -447,7 +446,6 @@ export function analyze_component(root, options) {
 				analysis,
 				options,
 				parent_element: null,
-				all_prop_names: new Set(),
 				has_props_rune: [false, false],
 				ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
 				instance_scope: instance.scope,
@@ -527,16 +525,6 @@ export function analyze_component(root, options) {
 		}
 	}
 
-	if (analysis.runes) {
-		const props = new Set();
-		for (const [name, binding] of instance.scope.declarations) {
-			if (binding.kind === 'prop' || binding.kind === 'bindable_prop') {
-				if (props.has(binding)) {
-				}
-			}
-		}
-	}
-
 	if (analysis.css.ast) {
 		analyze_css(analysis.css.ast, analysis);
 

packages/svelte/src/compiler/phases/2-analyze/types.d.ts

@@ -15,8 +15,6 @@ export interface AnalysisState {
 	options: ValidatedCompileOptions;
 	ast_type: 'instance' | 'template' | 'module';
 	parent_element: string | null;
-	/** Names of $props() and $props.bindable() */
-	all_prop_names: Set<string>;
 	has_props_rune: [props: boolean, bindings: boolean];
 	/** Which slots the current parent component has */
 	component_slots: Set<string>;

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

@@ -1095,12 +1095,6 @@ export const validation_runes = merge(validation, a11y_validators, {
 					if (value.type !== 'Identifier' || property.key.type !== 'Identifier') {
 						error(property, 'invalid-props-pattern');
 					}
-
-					if (state.all_prop_names.has(property.key.name)) {
-						error(property, 'duplicate-prop-name');
-					}
-
-					state.all_prop_names.add(property.key.name);
 				} else if (rune === '$props.bindable') {
 					error(property, 'invalid-props-rest-element');
 				}

packages/svelte/tests/runtime-runes/samples/bind-state-property/CheckBox.svelte

@@ -1,5 +1,6 @@
 <script>
-	let { checked, ...rest } = $props.bindable();
+	let { checked: _, ...rest } = $props();
+	let { checked } = $props.bindable();
 </script>
 
 <input type="checkbox" bind:checked {...rest} />