Merge branch 'main' into agoose77/fix-from-iter-non-iterable

docs/getting-started/community-tutorials.md

@@ -17,7 +17,7 @@ A tutorial presented at the SciPy conference on July 11, 2022.
 
 ### Format
 - [{fab}`github` GitHub repository](https://github.com/jpivarski-talks/2022-07-11-scipy-loopy-tutorial)
- with Jupyter Notebooks that can be run on [MyBinder](https://mybinder.org/).
+ with Jupyter Notebooks that can be run on [MyBinder](https://mybinder.org/v2/gh/jpivarski-talks/2022-07-11-scipy-loopy-tutorial/v1.0?urlpath=lab/tree/narrative.ipynb).
 - [{fab}`youtube` YouTube](https://www.youtube.com/watch?v=Dovyd72eD70) recording of presentation.
 
 ### Objectives

tests/test_2355_to_backend_record.py

@@ -0,0 +1,20 @@
+# BSD 3-Clause License; see https://github.com/scikit-hep/awkward-1.0/blob/main/LICENSE
+
+import numpy as np  # noqa: F401
+import pytest
+
+import awkward as ak
+from awkward._backends import NumpyBackend, TypeTracerBackend
+
+
+def test():
+    layout = ak.to_layout({"x": 1, "y": 1})
+    assert ak.backend(layout) == "cpu"
+    assert layout.backend is NumpyBackend.instance()
+
+    layout_tt = layout.to_backend("typetracer")
+    assert ak.backend(layout_tt) == "typetracer"
+    assert layout_tt.backend is TypeTracerBackend.instance()
+
+    with pytest.raises(TypeError):
+        layout_tt.to_backend("cpu")