code: public InternalContext createPeerContext(Template template, VariantIndexer[] indexers, int varSize, Vars rootParams) {
          InternalContext newContext = new InternalContext(template, this.out, rootParams,
                  indexers, varSize, null);
          newContext.localContext = this;
          return newContext;
      }
docs: Create a peer-context used by include/import.
  <p>
  Only share locals and out
  
  @param template template
  @param indexers indexers
  @param varSize  var size
  @param rootParams root params
  @return a new peer context