Cython pure python declare

doc/whatsnew/fragments/8024.false_positive

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+Added test for pure Python ``cython.declare`` usage, which should be valid no matter what is imported from the cython module.
+
+Refs #8024

tests/functional/r/regression_02/regression_cython_declare_8024.py

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+"""Test for cython pure Python false positives"""
+import cython
+
+# cython allows any import in pure Python mode. It can only
+# be determined correct at compile time
+# Check that it raises neither an import-error nor a
+# no-name-in-module error
+from cython.cimports.libc.math import sin
+
+# Same with type declarations
+# Check it doesn't generate a no-member error
+MY_VAR = cython.declare(cython.int, 0)
+print(sin(MY_VAR))

tests/functional/r/regression_02/regression_cython_declare_8024.rc

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+[BASIC]
+ignored-modules: non_existant_module
+
+[testoptions]
+requires: cython