code: function replacer(match, file, line, col) {
  		line = parseInt(line, 10);
  		col = parseInt(col, 10);
  
  		for (var i = 0; i < responses.length; i++) {
  			var meta = responses[i].meta;
  			var sourcemap = meta && meta.sourcemaps && meta.sourcemaps[file];
  
  			if (!sourcemap) {
  				continue;
  			}
  
  			var smc = new SourceMapConsumer(sourcemap);
  			var pos = smc.originalPositionFor({ line: line, column: col });
  
  			if (pos) {
  				return pos.name + ' (' + file + ':' + pos.line + ':' + pos.column + ')';
  			}
  		}
  
  		return match;
  	}
docs: On the client side, stacktrace.js has turned each entry into "symbol@file:line:col". Now try to source-map our way through it.