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

lib/ast.js

@@ -501,6 +501,18 @@ var AST_Destructuring = DEFNODE("Destructuring", "names is_array", {
     }
 });
 
+var AST_PrefixedTemplateString = DEFNODE("PrefixedTemplateString", "template_string prefix", {
+    $documentation: "A templatestring with a prefix, such as String.raw`foobarbaz`",
+    $propdoc: {
+        template_string: "[AST_TemplateString] The template string",
+        prefix: "[AST_SymbolRef|AST_PropAccess] The prefix, which can be a symbol such as `foo` or a dotted expression such as `String.raw`."
+    },
+    _walk: function(visitor) {
+        this.prefix._walk(visitor);
+        this.template_string._walk(visitor);
+    }
+})
+
 var AST_TemplateString = DEFNODE("TemplateString", "segments", {
     $documentation: "A template string literal",
     $propdoc: {

lib/output.js

@@ -776,6 +776,10 @@ function OutputStream(options) {
         self._do_print(output);
     });
 
+    DEFPRINT(AST_PrefixedTemplateString, function(self, output) {
+        self.prefix.print(output);
+        self.template_string.print(output);
+    });
     DEFPRINT(AST_TemplateString, function(self, output) {
         output.print("`");
         for (var i = 0; i < self.segments.length; i++) {

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({

test/compress/harmony.js

@@ -56,6 +56,14 @@ template_strings: {
     expect_exact: "``;`xx\\`x`;`${foo+2}`;` foo ${bar+`baz ${qux}`}`;";
 }
 
+template_string_prefixes: {
+    input: {
+        String.raw`foo`;
+        foo `bar`;
+    }
+    expect_exact: "String.raw`foo`;foo`bar`;";
+}
+
 destructuring_arguments: {
     input: {
         (function ( a ) { });