diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parser/truncation.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parser/truncation.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,74 @@
+load(libdir + "asserts.js");
+
+var cases = [
+    "{",
+    "{ ;",
+    "var",
+    "var x,",
+    "var x =",
+    "let",
+    "let x,",
+    "let x =",
+    "const",
+    "const x =",
+    "const x = 1,",
+    "if",
+    "if (",
+    "if (0) ; else",
+    "do",
+    "do ;",
+    "do ; while",
+    "do ; while (",
+    "do ; while (1",
+    "while",
+    "while (",
+    "while (1",
+    "while (1)",
+    "for",
+    "for (",
+    "for (;",
+    "for (;;",
+    "for (;;)",
+    "for (var",
+    "for (x",
+    "for (x in",
+    "for (x in y",
+    "for (x in y)",
+    "for (x of",
+    "for (x of y",
+    "for (x of y)",
+    "switch",
+    "switch (",
+    "switch (x",
+    "switch (x)",
+    "with",
+    "with (",
+    "with (x",
+    "with (x)",
+    "a:",
+    "throw",
+    "try",
+    "try {",
+    "try {} catch",
+    "try {} catch (",
+    "try {} catch (exc",
+    "try {} catch (exc if",
+    "try {} catch (exc if 1",
+    "try {} finally",
+    "try {} finally {",
+
+    "function",
+    "function f",
+    "function f(",
+    "function f()",
+    "function f() {",
+    "(function",
+    "(function f",
+    "(function f(",
+    "(function f()",
+
+];
+
+for (var s of cases)
+    assertThrowsInstanceOf(() => Function(s), SyntaxError);
+