Allow coercion of C literal lists to stl types.

Cython/Compiler/ExprNodes.py

@@ -6687,6 +6687,9 @@ class ListNode(SequenceNode):
                 if isinstance(arg, CoerceToPyTypeNode):
                     arg = arg.arg
                 self.args[i] = arg.coerce_to(base_type, env)
+        elif dst_type.is_cpp_class:
+            # TODO(robertwb): Avoid object conversion for vector/list/set.
+            return TypecastNode(self.pos, operand=self, type=PyrexTypes.py_object_type).coerce_to(dst_type, env)
         elif self.mult_factor:
             error(self.pos, "Cannot coerce multiplied list to '%s'" % dst_type)
         elif dst_type.is_struct:

tests/run/cpp_stl_conversion.pyx

@@ -116,6 +116,14 @@ def test_double_vector(o):
     cdef vector[double] v = o
     return v
 
+def test_repeated_double_vector(a, b, int n):
+    """
+    >>> test_repeated_double_vector(1, 1.5, 3)
+    [1.0, 1.5, 1.0, 1.5, 1.0, 1.5]
+    """
+    cdef vector[double] v = [a, b] * n
+    return v
+
 ctypedef int my_int
 
 def test_typedef_vector(o):