| ast | Display the abstract syntax tree |
| cst | Call stack tree |
| mem_used | How much memory is currently used by R? |
| obj_addr | Find memory location of objects and their children. |
| obj_addrs | Find memory location of objects and their children. |
| obj_size | Calculate the size of an object. |
| obj_sizes | Calculate the size of an object. |
| ref | Display tree of references |
| sxp | Inspect an object |
| tree | Pretty tree-like object printing |
| tree_label | Build element or node label in tree |