[Bug libstdc++/92759] New: Typo in libstdcxx/v6/xmethods.py

[yyc1992 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92759

            Bug ID: 92759
           Summary: Typo in libstdcxx/v6/xmethods.py
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yyc1992 at gmail dot com
  Target Milestone: ---

I get the following warning when running gdb/rr.

```
/usr/lib/../share/gcc-9.2.0/python/libstdcxx/v6/xmethods.py:731: SyntaxWarning:
list indices must be integers or slices, not str; perhaps you missed a comma?
  refcounts = ['_M_refcount']['_M_pi']
```

Looking at the
[code](https://github.com/gcc-mirror/gcc/blob/daa87973f7a00bf3bb81d0644dd60f4efb83bb65/libstdc%2B%2B-v3/python/libstdcxx/v6/xmethods.py#L731)
I think that line should read

```
        refcounts = obj['_M_refcount']['_M_pi']
```

instead.

I could submit a patch but I feel like it'll be faster/easier for someone here
to just fix this....