mark reassigned/mutated when done inline in the template

src/compiler/compile/nodes/shared/Expression.ts

@@ -114,16 +114,14 @@ export default class Expression {
 				let names;
 				let deep = false;
 
-				if (function_expression) {
+				if (node.type === 'AssignmentExpression') {
-					if (node.type === 'AssignmentExpression') {
+					deep = node.left.type === 'MemberExpression';
-						deep = node.left.type === 'MemberExpression';
+					names = deep
-						names = deep
+						? [get_object(node.left).name]
-							? [get_object(node.left).name]
+						: extract_names(node.left);
-							: extract_names(node.left);
+				} else if (node.type === 'UpdateExpression') {
-					} else if (node.type === 'UpdateExpression') {
+					const { name } = get_object(node.argument);
-						const { name } = get_object(node.argument);
+					names = [name];
-						names = [name];
-					}
 				}
 
 				if (names) {

test/vars/samples/mutated-reassigned-in-expression/_config.js

@@ -0,0 +1,50 @@
+export default {
+	test(assert, vars) {
+		assert.deepEqual(vars, [
+			{
+				name: "a",
+				export_name: null,
+				injected: false,
+				module: false,
+				mutated: false,
+				reassigned: true,
+				referenced: true,
+				referenced_from_script: false,
+				writable: true
+			},
+			{
+				name: "b",
+				export_name: null,
+				injected: false,
+				module: false,
+				mutated: true,
+				reassigned: false,
+				referenced: true,
+				referenced_from_script: false,
+				writable: true
+			},
+			{
+				name: "c",
+				export_name: null,
+				injected: false,
+				module: false,
+				mutated: false,
+				reassigned: true,
+				referenced: true,
+				referenced_from_script: false,
+				writable: true
+			},
+			{
+				name: "d",
+				export_name: null,
+				injected: false,
+				module: false,
+				mutated: true,
+				reassigned: false,
+				referenced: true,
+				referenced_from_script: false,
+				writable: true
+			}
+		]);
+	}
+};

test/vars/samples/mutated-reassigned-in-expression/input.svelte

@@ -0,0 +1,10 @@
+<script>
+	let a = 0;
+  let b = {};
+  let c = {};
+  let d = 0;
+</script>
+{() => a = 1}
+{() => b.a = 1}
+{c = 1}
+{d.a = 1}