fix C array assignments from lists of C arrays

Cython/Compiler/ExprNodes.py

@@ -6767,11 +6767,18 @@ class ListNode(SequenceNode):
             else:
                 offset = ''
             for i, arg in enumerate(self.args):
-                code.putln("%s[%s%s] = %s;" % (
-                    self.result(),
-                    i,
-                    offset,
-                    arg.result()))
+                if arg.type.is_array:
+                    code.globalstate.use_utility_code(UtilityCode.load_cached("IncludeStringH", "StringTools.c"))
+                    code.putln("memcpy(&(%s[%s%s]), %s, sizeof(%s[0]));" % (
+                        self.result(), i, offset,
+                        arg.result(), self.result()
+                    ))
+                else:
+                    code.putln("%s[%s%s] = %s;" % (
+                        self.result(),
+                        i,
+                        offset,
+                        arg.result()))
             if self.mult_factor:
                 code.putln("}")
                 code.putln("}")

tests/run/carray_coercion.pyx

@@ -76,6 +76,15 @@ def assign_int_array_array():
     return v
 
 
+def assign_int_array_array_from_tuples():
+    """
+    >>> assign_int_array_array_from_tuples()
+    [[11, 12, 13], [21, 22, 23]]
+    """
+    cdef int[2][3] v = ([11, 12, 13], [21, 22, 23])
+    return v
+
+
 def build_from_list_of_arrays():
     """
     >>> build_from_list_of_arrays()
@@ -87,6 +96,17 @@ def build_from_list_of_arrays():
     return v
 
 
+def build_from_tuple_of_arrays():
+    """
+    >>> build_from_tuple_of_arrays()
+    [[11, 12, 13], [21, 22, 23]]
+    """
+    cdef int[3] x = [11, 12, 13]
+    cdef int[3] y = [21, 22, 23]
+    cdef int[2][3] v = (x, y)
+    return v
+
+
 ctypedef struct MyStructType:
     int x
     double y