id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
438590881,MDU6SXNzdWU0Mzg1OTA4ODE=,2931,MergeError: coordinate mytime1 shares a name with a dataset dimension …. This is disallowed by the xarray data model.,15742456,open,0,,,3,2019-04-30T03:33:08Z,2019-05-06T15:10:18Z,,NONE,,,,"```python
import xarray as xr
import pandas as p
import numpy as np

var1 = np.ones((364))
tt1=p.date_range('1/1/2018','12/30/2018')
tt1.name= 'time1_name'

var=xr.Dataset(
		data_vars={
			'var1':(('mytime1'),var1),
			},
		coords={
			'mytime1':tt1,
			}
)

```
#### Problem description
I got the following error ""MergeError: coordinate mytime1 shares a name with a dataset dimension, but is not a 1D variable along that dimension. This is disallowed by the xarray data model."" when I inlcude name attribue ""time1_name"" to the var1 dimension mytime1.

#### Expected Output

#### Output of ``xr.show_versions()``

<details>
INSTALLED VERSIONS
------------------
commit: None
python: 2.7.14.final.0
python-bits: 64
OS: Darwin
OS-release: 18.5.0
machine: x86_64
processor: i386
byteorder: little
LC_ALL: en_US.UTF-8
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

xarray: 0.10.9
pandas: 0.23.4
numpy: 1.14.2
scipy: 1.0.0
netCDF4: 1.3.1
h5netcdf: None
h5py: 2.7.1
Nio: None
zarr: None
cftime: None
PseudonetCDF: None
rasterio: None
iris: None
bottleneck: 1.2.1
cyordereddict: None
dask: 0.16.1
distributed: 1.20.2
matplotlib: 2.1.2
cartopy: 0.16.0
seaborn: 0.8.1
setuptools: 40.8.0
pip: 18.1
conda: 4.4.10
pytest: 3.3.2
IPython: 5.4.1
sphinx: 1.6.6
</details>","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/2931/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,issue