a var declared again: its declarator has the binding, and an initializer there reassigns

packages/svelte/src/compiler/phases/scope.js

@@ -1183,7 +1183,21 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
 			]);
 		}
 		for (const reference of answer.references) {
-			if (reference.declares) continue;
+			if (reference.declares) {
+				// `var x` again: the declarator declares the binding the first one made
+				const ours = reference.binding === null ? undefined : from_parser.get(reference.binding);
+				/** @type {any} */
+				let declarator = parentOf(reference.node);
+				while (declarator && /Pattern$|^Property$|^RestElement$/.test(declarator.type)) {
+					declarator = parentOf(declarator);
+				}
+				if (ours && declarator?.type === 'VariableDeclarator') {
+					declarators.push([declarator, ours]);
+					// an initializer there assigns again, so the first one is not the value
+					if (reference.write) ours.reassigned = true;
+				}
+				continue;
+			}
 			const binding = reference.binding === null ? undefined : from_parser.get(reference.binding);
 			entries.push([
 				reference.node,

packages/svelte/tests/runtime-legacy/samples/var-redeclared/_config.js

@@ -0,0 +1,5 @@
+import { test } from '../../test';
+
+export default test({
+	html: '<p>42 3 4</p>'
+});

packages/svelte/tests/runtime-legacy/samples/var-redeclared/main.svelte

@@ -0,0 +1,9 @@
+<script>
+	var test = "";
+	var test = 42;
+
+	var { a, b: [c] } = { a: 1, b: [2] };
+	var { a, b: [c] } = { a: 3, b: [4] };
+</script>
+
+<p>{test} {a} {c}</p>