Replace calls to _report_generic_error with a more useful error message. #15316
Description
Right now, many failures of np.dtype(obj) go to this path:
numpy/numpy/core/src/multiarray/descriptor.c
Lines 42 to 49 in 80fc0f5
For example
numpy/numpy/core/src/multiarray/descriptor.c
Lines 443 to 446 in 80fc0f5
We should replace some or all of these calls in this file with more helpful error messages, such as in the above case:
-_report_generic_error();
+PyErr_Format(PyExc_TypeError, "Field elements must be 2-tuples, got %R", item);If we replace all of them, then we should remove the _report_generic_error function entirely