1 files changed, 63 insertions, 0 deletions
diff --git a/js/src/tests/non262/syntax/syntax-parsed-arrow-then-sourcemap-directive.js b/js/src/tests/non262/syntax/syntax-parsed-arrow-then-sourcemap-directive.js
new file mode 100644
index 0000000000..71e2b2bdaf
--- /dev/null
+++ b/js/src/tests/non262/syntax/syntax-parsed-arrow-then-sourcemap-directive.js
@@ -0,0 +1,63 @@
+// |reftest| skip-if(!xulRuntime.shell) -- needs Debugger
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1596706;
+var summary =
+  "Properly apply a source map directive that's only tokenized by a syntax " +
+  "parser (because the directive comment appears immediately after an arrow " +
+  "function with expression body)";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger(g);
+
+var script;
+dbg.onDebuggerStatement = function (frame)
+{
+  script = frame.script;
+};
+
+function checkSourceMapFor(arrowFunc, sourceMap)
+{
+  g.evaluate(`${arrowFunc}
+//# sourceMappingURL=${sourceMap}
+debugger;`);
+
+  assertEq(script instanceof Debugger.Script, true,
+           "expected a Debugger.Script for " + arrowFunc);
+
+  var source = script.source;
+  assertEq(source instanceof Debugger.Source, true,
+           "expected a Debugger.Source for " + arrowFunc);
+
+  assertEq(source.sourceMapURL, sourceMap,
+           "unexpected source map for " + arrowFunc);
+}
+
+// block followed by semicolon
+checkSourceMapFor("x=>{};", "http://example.com/foo.js");
+
+// block not followed by semicolon
+checkSourceMapFor("x=>{}", "http://example.com/bar.js");
+
+// expr followed by semicolon
+checkSourceMapFor("x=>y;", "http://example.com/baz.js");
+
+// expr not followed by semicolon
+checkSourceMapFor("x=>y", "http://example.com/bar.js");
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");