issues: 1549861293

What happened?

Unhelpful error raised by xr.broadcast when supplied with an int.

What did you expect to happen?

The broadcast to succeed I think?

Minimal Complete Verifiable Example

```Python In [1]: import xarray as xr

In [2]: da = xr.DataArray([5, 4], dims='x')

In [3]: xr.broadcast(da, 1)

AttributeError Traceback (most recent call last) Cell In[3], line 1 ----> 1 xr.broadcast(da, 1)

File ~/miniconda3/envs/xrdev3.9/lib/python3.9/site-packages/xarray/core/alignment.py:1049, in broadcast(exclude, args) 1047 if exclude is None: 1048 exclude = set() -> 1049 args = align(args, join="outer", copy=False, exclude=exclude) 1051 dims_map, common_coords = _get_broadcast_dims_map_common_coords(args, exclude) 1052 result = [_broadcast_helper(arg, exclude, dims_map, common_coords) for arg in args]

File ~/miniconda3/envs/xrdev3.9/lib/python3.9/site-packages/xarray/core/alignment.py:772, in align(join, copy, indexes, exclude, fill_value, *objects) 576 """ 577 Given any number of Dataset and/or DataArray objects, returns new 578 objects with aligned indexes and dimension sizes. (...) 762 763 """ 764 aligner = Aligner( 765 objects, 766 join=join, (...) 770 fill_value=fill_value, 771 ) --> 772 aligner.align() 773 return aligner.results

File ~/miniconda3/envs/xrdev3.9/lib/python3.9/site-packages/xarray/core/alignment.py:556, in Aligner.align(self) 553 self.results = (obj.copy(deep=self.copy),) 554 return --> 556 self.find_matching_indexes() 557 self.find_matching_unindexed_dims() 558 self.assert_no_index_conflict()

File ~/miniconda3/envs/xrdev3.9/lib/python3.9/site-packages/xarray/core/alignment.py:262, in Aligner.find_matching_indexes(self) 259 objects_matching_indexes = [] 261 for obj in self.objects: --> 262 obj_indexes, obj_index_vars = self._normalize_indexes(obj.xindexes) 263 objects_matching_indexes.append(obj_indexes) 264 for key, idx in obj_indexes.items():

AttributeError: 'int' object has no attribute 'xindexes' ```

MVCE confirmation

• [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
• [X] Complete example — the example is self-contained, including all data and the text of any traceback.
• [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
• [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

No response

Anything else we need to know?

This clearly has something to do with a change in the flexible indexes refactor, as it complains about .xindexes not being present. @benbovy

Environment

The main branch