py/objarray: Fix constructing a memoryview from a memoryview.

Fixes issue #7261.

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/basics/memoryview_gc.py b/tests/basics/memoryview_gc.py
index d366cbbb1..5cd6124ad 100644
--- a/tests/basics/memoryview_gc.py
+++ b/tests/basics/memoryview_gc.py
@@ -21,3 +21,13 @@ for i in range(100000):
 
 # check that the memoryview is still what we want
 print(list(m))
+
+# check that creating a memoryview of a memoryview retains the underlying data
+m = None
+gc.collect()  # cleanup from previous test
+m = memoryview(memoryview(bytearray(i for i in range(50)))[5:-5])
+print(sum(m), list(m[:10]))
+gc.collect()
+for i in range(10):
+    list(range(10))  # allocate memory to overwrite any reclaimed heap
+print(sum(m), list(m[:10]))