assignment, not mutation

packages/svelte/src/compiler/errors.js

@@ -203,7 +203,7 @@ const runes = {
 	/** @param {string} name */
 	'invalid-runes-mode-import': (name) => `${name} cannot be used in runes mode`,
 	'duplicate-props-rune': () => `Cannot use $props() more than once`,
-	'invalid-each-mutation': () => `Cannot mutate each block references directly in runes mode`
+	'invalid-each-assignment': () => `Cannot reassign each block argument in runes mode`
 };
 
 /** @satisfies {Errors} */

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

@@ -917,7 +917,7 @@ function validate_assignment(node, argument, state) {
 		}
 
 		if (binding?.kind === 'each') {
-			error(node, 'invalid-each-mutation');
+			error(node, 'invalid-each-assignment');
 		}
 	}
 

packages/svelte/tests/compiler-errors/samples/runes-invalid-each-mutation/_config.js

@@ -2,7 +2,7 @@ import { test } from '../../test';
 
 export default test({
 	error: {
-		code: 'invalid-each-mutation',
-		message: 'Cannot mutate each block references directly in runes mode'
+		code: 'invalid-each-assignment',
+		message: 'Cannot reassign each block argument in runes mode'
 	}
 });