Fix #173.

acorn.js

@@ -803,12 +803,6 @@
         return finishToken(_dollarBraceL);
       }
     }
-
-    if (code === 125) { // '}'
-      ++tokPos;
-      return finishToken(_braceR, undefined, false);
-    }
-
     // anything else is considered string literal
     return readTmplString();
   }
@@ -2153,10 +2147,11 @@
   // Parse template expression.
 
   function parseTemplate() {
+    var oldInTemplate = inTemplate;
+    inTemplate = true;
     var node = startNode();
     node.expressions = [];
     node.quasis = [];
-    inTemplate = true;
     next();
     for (;;) {
       var elem = startNode();
@@ -2176,7 +2171,7 @@
       tokPos = tokEnd;
       expect(_braceR);
     }
-    inTemplate = false;
+    inTemplate = oldInTemplate;
     next();
     return finishNode(node, "TemplateLiteral");
   }

test/tests-harmony.js

@@ -14191,3 +14191,44 @@ test("import foo, * as bar from 'baz';", {
     }
   }]
 }, {ecmaVersion: 6});
+
+// https://github.com/marijnh/acorn/issues/173
+test("`{${x}}`, `}`", {
+  type: "Program",
+  body: [{
+    type: "ExpressionStatement",
+    expression: {
+      type: "SequenceExpression",
+      expressions: [
+        {
+          type: "TemplateLiteral",
+          expressions: [{
+            type: "Identifier",
+            name: "x"
+          }],
+          quasis: [
+            {
+              type: "TemplateElement",
+              value: {cooked: "{", raw: "{"},
+              tail: false
+            },
+            {
+              type: "TemplateElement",
+              value: {cooked: "}", raw: "}"},
+              tail: true
+            }
+          ]
+        },
+        {
+          type: "TemplateLiteral",
+          expressions: [],
+          quasis: [{
+            type: "TemplateElement",
+            value: {cooked: "}", raw: "}"},
+            tail: true
+          }]
+        }
+      ]
+    }
+  }]
+}, {ecmaVersion: 6});