James change to use original source for mapping

lib/output.js

@@ -306,11 +306,13 @@ function OutputStream(options) {
 
     var add_mapping = options.source_map ? function(token, name) {
         try {
+            var originalSource = token.__HACK_CODE__.substring(token.pos, token.endpos)
+
             if (token) options.source_map.add(
                 token.file || "?",
                 current_line, current_col,
                 token.line, token.col,
-                (!name && token.type == "name") ? token.value : name
+                originalSource // (!name && token.type == "name") ? token.value : name
             );
         } catch(ex) {
             AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", {

lib/parse.js

@@ -684,6 +684,10 @@ function parse($TEXT, options) {
         S.in_directives = S.in_directives && (
             S.token.type == "string" || is("punc", ";")
         );
+
+        // Hacks in the source code
+        S.token.__HACK_CODE__ = $TEXT
+
         return S.token;
     };