bpo-42524: Add retval [variable] option to pdb
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Add optional argument to pdb `retval` command, to allow accessing the
current value being returned in the stack.
For example, given the following code:
```python
def get_thing():
debugger()
return Thing(value=123)
```
```
(pdb) retval
<Thing instance at 0x1234>
(pdb) retval xx
(pdb) xx.value
123
```
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Add optional argument to pdb
retvalcommand, to allow accessing thecurrent value being returned in the stack.
For example, given the following code:
https://bugs.python.org/issue42524