diff --git a/src/compiler/compile/Component.ts b/src/compiler/compile/Component.ts
index ffac6e1f07..f7d8e8f568 100644
--- a/src/compiler/compile/Component.ts
+++ b/src/compiler/compile/Component.ts
@@ -794,20 +794,31 @@ export default class Component {
 				}
 
 				let deep = false;
-				let names: string[] | undefined; 
+				let names: string[] = [];
 
 				if (node.type === 'AssignmentExpression') {
-					deep = node.left.type === 'MemberExpression';
-					names = deep
-						? [get_object(node.left).name]
-						: extract_names(node.left);
+					if (node.left.type === 'ArrayPattern') {
+						walk(node.left, {
+							enter(node: Node, parent: Node) {
+								if (node.type === 'Identifier' &&
+									parent.type !== 'MemberExpression' &&
+									(parent.type !== 'AssignmentPattern' || parent.right !== node)) {
+										names.push(node.name);
+								}
+							}
+						});
+					} else {
+						deep = node.left.type === 'MemberExpression';
+						names = deep
+							? [get_object(node.left).name]
+							: extract_names(node.left);
+					}
 				} else if (node.type === 'UpdateExpression') {
 					deep = node.argument.type === 'MemberExpression';
 					const { name } = get_object(node.argument);
-					names = [name];
+					names.push(name);
 				}
-
-				if (names) {
+				if (names.length > 0) {
 					names.forEach(name => {
 						let current_scope = scope;
 						let declaration;
diff --git a/test/runtime/samples/assignment-to-const1/_config.js b/test/runtime/samples/assignment-to-const1/_config.js
new file mode 100644
index 0000000000..2fd0447458
--- /dev/null
+++ b/test/runtime/samples/assignment-to-const1/_config.js
@@ -0,0 +1,3 @@
+export default {
+	html: '<p>2, 1</p>'
+};
diff --git a/test/runtime/samples/assignment-to-const1/main.svelte b/test/runtime/samples/assignment-to-const1/main.svelte
new file mode 100644
index 0000000000..f221249193
--- /dev/null
+++ b/test/runtime/samples/assignment-to-const1/main.svelte
@@ -0,0 +1,6 @@
+<script>
+	const arr = [1, 2];
+	[arr[0], arr[1]] = [arr[1], arr[0]];
+</script>
+
+<p>{arr[0]}, {arr[1]}</p>
diff --git a/test/runtime/samples/assignment-to-const2/_config.js b/test/runtime/samples/assignment-to-const2/_config.js
new file mode 100644
index 0000000000..9802ca2c44
--- /dev/null
+++ b/test/runtime/samples/assignment-to-const2/_config.js
@@ -0,0 +1,3 @@
+export default {
+	html: '<p>[{"a":2},100]</p>'
+};
diff --git a/test/runtime/samples/assignment-to-const2/main.svelte b/test/runtime/samples/assignment-to-const2/main.svelte
new file mode 100644
index 0000000000..c805e4b589
--- /dev/null
+++ b/test/runtime/samples/assignment-to-const2/main.svelte
@@ -0,0 +1,7 @@
+<script>
+	const a = 100;
+	const arr = [{ a: 1 }, 2];
+	[arr[0].a, arr[1] = a] = [arr[1]];
+</script>
+
+<p>{JSON.stringify(arr)}</p>
diff --git a/test/validator/samples/assignment-to-const-5/errors.json b/test/validator/samples/assignment-to-const-5/errors.json
new file mode 100644
index 0000000000..21de70863c
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-5/errors.json
@@ -0,0 +1,17 @@
+[
+	{
+		"code": "assignment-to-const",
+		"message": "You are assigning to a const",
+		"start": {
+			"line": 3,
+			"column": 1,
+			"character": 31
+		},
+		"end": {
+			"line": 3,
+			"column": 33,
+			"character": 63
+		},
+		"pos": 31
+	}
+]
\ No newline at end of file
diff --git a/test/validator/samples/assignment-to-const-5/input.svelte b/test/validator/samples/assignment-to-const-5/input.svelte
new file mode 100644
index 0000000000..76907b94be
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-5/input.svelte
@@ -0,0 +1,6 @@
+<script>
+	const arr = [1, 2];
+	[arr, arr[1]] = [arr[1], arr[0]];
+</script>
+
+{arr}
\ No newline at end of file
diff --git a/test/validator/samples/assignment-to-const-6/errors.json b/test/validator/samples/assignment-to-const-6/errors.json
new file mode 100644
index 0000000000..0637a088a0
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-6/errors.json
@@ -0,0 +1 @@
+[]
\ No newline at end of file
diff --git a/test/validator/samples/assignment-to-const-6/input.svelte b/test/validator/samples/assignment-to-const-6/input.svelte
new file mode 100644
index 0000000000..8da59b261e
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-6/input.svelte
@@ -0,0 +1,6 @@
+<script>
+	const arr = [1, 2];
+	[arr[0], arr[1]] = [arr[1], arr[0]];
+</script>
+
+{arr}
\ No newline at end of file
diff --git a/test/validator/samples/assignment-to-const-7/errors.json b/test/validator/samples/assignment-to-const-7/errors.json
new file mode 100644
index 0000000000..34c88bebf6
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-7/errors.json
@@ -0,0 +1,17 @@
+[
+	{
+		"code": "assignment-to-const",
+		"message": "You are assigning to a const",
+		"start": {
+			"line": 3,
+			"column": 1,
+			"character": 43
+		},
+		"end": {
+			"line": 3,
+			"column": 42,
+			"character": 84
+		},
+		"pos": 43
+	}
+]
\ No newline at end of file
diff --git a/test/validator/samples/assignment-to-const-7/input.svelte b/test/validator/samples/assignment-to-const-7/input.svelte
new file mode 100644
index 0000000000..ed7b37ae26
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-7/input.svelte
@@ -0,0 +1,6 @@
+<script>
+	const arr = [{1: {arr: 2}}, 2];
+	[{1: { arr }}, arr[1]] = [arr[1], arr[0]];
+</script>
+
+{arr}
\ No newline at end of file
diff --git a/test/validator/samples/assignment-to-const-8/errors.json b/test/validator/samples/assignment-to-const-8/errors.json
new file mode 100644
index 0000000000..fe51488c70
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-8/errors.json
@@ -0,0 +1 @@
+[]
diff --git a/test/validator/samples/assignment-to-const-8/input.svelte b/test/validator/samples/assignment-to-const-8/input.svelte
new file mode 100644
index 0000000000..8af787f4f0
--- /dev/null
+++ b/test/validator/samples/assignment-to-const-8/input.svelte
@@ -0,0 +1,6 @@
+<script>
+	const arr = [1, 2];
+	[arr[0], arr[1] = arr] = [arr[1], arr[0]];
+</script>
+
+{arr}