docs: @Override public JCTree visitVariable(VariableTree node, Void p) {
  		JCVariableDecl original = node instanceof JCVariableDecl ? (JCVariableDecl) node : null;
  		JCVariableDecl copy = (JCVariableDecl) super.visitVariable(node, p);
  		if (original == null) return copy;
  		copy.sym = original.sym;
  		if (copy.sym != null) copy.type = original.type;
  		if (copy.type != null) {
  			boolean wipeSymAndType = copy.type.isErroneous();
  			if (!wipeSymAndType) {
  				TypeTag typeTag = TypeTag.typeTag(copy.type);
  				wipeSymAndType = (CTC_NONE.equals(typeTag) || CTC_ERROR.equals(typeTag) || CTC_UNKNOWN.equals(typeTag) || CTC_UNDETVAR.equals(typeTag));
  			}
  			
  			if (wipeSymAndType) {
  				copy.sym = null;
  				copy.type = null;
  			}
  		}
  		
  		return copy;
  	}