Pass env to chunker for use in error messages

lib/less/chunker.js

@@ -1,7 +1,7 @@
 var LessError = require('./less-error.js');
 
 // Split the input into chunks.
-module.exports = function (parser, input) {
+module.exports = function (parser, input, env) {
     var len = input.length, level = 0, parenLevel = 0,
         lastOpening, lastOpeningParen, lastMultiComment, lastMultiCommentEndBrace,
         chunks = [], emitFrom = 0,

lib/less/parser.js

@@ -356,7 +356,7 @@ var Parser = function Parser(env) {
             parser.imports.contents[env.currentFileInfo.filename] = str;
 
             try {
-                chunks = chunker(parser, str);
+                chunks = chunker(parser, str, env);
             } catch (ex) {
                 return callback(new LessError(parser, error, env));
             }