342   this.walk(function (chunk, original) {  argument
344     if (original.source !== null
345         && original.line !== null
346         && original.column !== null) {
347       if(lastOriginalSource !== original.source
348          || lastOriginalLine !== original.line
349          || lastOriginalColumn !== original.column
350          || lastOriginalName !== original.name) {
352           source: original.source,
353           original: {  property
354             line: original.line,
355             column: original.column
361           name: original.name
364       lastOriginalSource = original.source;
365       lastOriginalLine = original.line;
366       lastOriginalColumn = original.column;
367       lastOriginalName = original.name;
389             source: original.source,
390             original: {  property
391               line: original.line,
392               column: original.column
398             name: original.name