Support inplace assignment for memoryviews and buffers

Cython/Compiler/Nodes.py

@@ -5050,9 +5050,16 @@ class InPlaceAssignmentNode(AssignmentNode):
         self.lhs.analyse_target_declaration(env)
 
     def analyse_types(self, env):
+        import ExprNodes
+
         self.rhs.analyse_types(env)
         self.lhs.analyse_target_types(env)
 
+        # When assigning to a fully indexed buffer or memoryview, coerce the rhs
+        if (isinstance(self.lhs, ExprNodes.IndexNode) and
+                (self.lhs.memslice_index or self.lhs.is_buffer_access)):
+            self.rhs = self.rhs.coerce_to(self.lhs.type, env)
+
     def generate_execution_code(self, code):
         import ExprNodes
         self.rhs.generate_evaluation_code(code)

tests/run/bufaccess.pyx

@@ -1127,3 +1127,17 @@ def buffer_nogil_oob():
     with nogil:
         buf[5] = 10
     return buf[1]
+
+def get_int():
+    return 10
+
+@testcase
+def test_inplace_assignment():
+    """
+    >>> test_inplace_assignment()
+    10
+    """
+    cdef object[int, ndim=1] buf = IntMockBuffer(None, [1, 2, 3])
+
+    buf[0] = get_int()
+    print buf[0]

tests/run/memslice.pyx

@@ -2202,3 +2202,17 @@ def test_noneslice_del():
         del m
         print m
 
+def get_int():
+    return 10
+
+@testcase
+def test_inplace_assignment():
+    """
+    >>> test_inplace_assignment()
+    10
+    """
+    cdef int[10] a
+    cdef int[:] m = a
+
+    m[0] = get_int()
+    print m[0]