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diff --git a/deps/v8/test/mjsunit/regress/regress-8630.js b/deps/v8/test/mjsunit/regress/regress-8630.js
new file mode 100644
index 0000000000..f51807b4a5
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+++ b/deps/v8/test/mjsunit/regress/regress-8630.js
@@ -0,0 +1,32 @@
+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+// Parameters can't have parentheses (both patterns and identifiers)
+assertThrows("( ({x: 1}) ) => {};", SyntaxError);
+assertThrows("( (x) ) => {}", SyntaxError);
+assertThrows("( ({x: 1}) = y ) => {}", SyntaxError);
+assertThrows("( (x) = y ) => {}", SyntaxError);
+
+// Declarations can't have parentheses (both patterns and identifiers)
+assertThrows("let [({x: 1})] = [];", SyntaxError);
+assertThrows("let [(x)] = [];", SyntaxError);
+assertThrows("let [({x: 1}) = y] = [];", SyntaxError);
+assertThrows("let [(x) = y] = [];", SyntaxError);
+assertThrows("var [({x: 1})] = [];", SyntaxError);
+assertThrows("var [(x)] = [];", SyntaxError);
+assertThrows("var [({x: 1}) = y] = [];", SyntaxError);
+assertThrows("var [(x) = y] = [];", SyntaxError);
+
+// Patterns in can't have parentheses in assignments either
+assertThrows("[({x: 1}) = y] = [];", SyntaxError);
+
+// Parentheses are fine around identifiers in assignments though, even inside a
+// pattern
+var x;
+[(x)] = [2];
+assertEquals(x, 2);
+[(x) = 3] = [];
+assertEquals(x, 3);