Change WARN_ON_WRITE Deprecation Warning

Change WARN_ON_WRITE Deprecation Warning to include returning a copy
when selecting muultiple fields of a structured array.

1 files changed, 4 insertions, 3 deletions

diff --git a/numpy/core/src/multiarray/arrayobject.c b/numpy/core/src/multiarray/arrayobject.c
index e8bc6b7b6..4a219e70e 100644
--- a/numpy/core/src/multiarray/arrayobject.c
+++ b/numpy/core/src/multiarray/arrayobject.c
@@ -694,9 +694,10 @@ array_might_be_written(PyArrayObject *obj)
 {
     const char *msg =
         "Numpy has detected that you (may be) writing to an array returned\n"
-        "by numpy.diagonal. This code will likely break in the next numpy\n"
-        "release -- see numpy.diagonal docs for details. The quick fix is\n"
-        "to make an explicit copy (e.g., do arr.diagonal().copy()).";
+        "by numpy.diagonal or by selecting multiple fields in a structured\n"
+        "array. This code will likely break in the next numpy release --\n"
+        "see numpy.diagonal or structured array docs for details. The quick\n"
+        "fix is to make an explicit copy (e.g., do arr.diagonal().copy()).";
     if (PyArray_FLAGS(obj) & NPY_ARRAY_WARN_ON_WRITE) {
         if (DEPRECATE_FUTUREWARNING(msg) < 0) {
             return -1;