remove compiler error due to potential of false positives

packages/svelte/src/compiler/errors.js

@@ -182,8 +182,6 @@ const runes = {
 		`$props() assignment must not contain nested properties or computed keys`,
 	'invalid-props-location': () =>
 		`$props() can only be used at the top level of components as a variable declaration initializer`,
-	'invalid-props-mutation': () =>
-		'Properties defined by $props() cannot be mutated. Use $props.bindable() instead, or make a copy of the value and reassign it.',
 	/** @param {string} rune */
 	'invalid-state-location': (rune) =>
 		`${rune}(...) can only be used as a variable declaration initializer or a class field`,

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

@@ -330,10 +330,6 @@ const validation = {
 			// TODO handle mutations of non-state/props in runes mode
 		}
 
-		if (assignee.type === 'MemberExpression' && binding?.kind === 'prop') {
-			error(node, 'invalid-props-mutation');
-		}
-
 		if (node.name === 'group') {
 			if (!binding) {
 				error(node, 'INTERNAL', 'Cannot find declaration for bind:group');
@@ -984,11 +980,6 @@ function validate_assignment(node, argument, state) {
 		if (binding?.kind === 'each') {
 			error(node, 'invalid-each-assignment');
 		}
-	} else if (argument.type === 'MemberExpression') {
-		const id = object(argument);
-		if (id && state.scope.get(id.name)?.kind === 'prop') {
-			error(node, 'invalid-props-mutation');
-		}
 	}
 
 	let obj = /** @type {import('estree').Expression | import('estree').Super} */ (argument);

packages/svelte/tests/compiler-errors/samples/runes-non-bindable-prop-mutated/_config.js

@@ -1,9 +0,0 @@
-import { test } from '../../test';
-
-export default test({
-	error: {
-		code: 'invalid-props-mutation',
-		message:
-			'Properties defined by $props() cannot be mutated. Use $props.bindable() instead, or make a copy of the value and reassign it.'
-	}
-});

packages/svelte/tests/compiler-errors/samples/runes-non-bindable-prop-mutated/main.svelte

@@ -1,4 +0,0 @@
-<script>
-	let { x } = $props();
-	x.y = 1;
-</script>