prefixed template strings, like "String.rawfoo\nbar".

lib/parse.js

@@ -1717,6 +1717,13 @@ function parse($TEXT, options) {
             });
             return arrow_function(expr);
         }
+        if ((expr instanceof AST_SymbolRef || expr instanceof AST_PropAccess) && is("punc", "`")) {
+            return new AST_PrefixedTemplateString({
+                start: start,
+                prefix: expr,
+                template_string: template_string()
+            })
+        }
         if (commas && is("punc", ",")) {
             next();
             return new AST_Seq({