Fix sizeof(my_fused_type)

Cython/Compiler/ExprNodes.py

@@ -7049,6 +7049,8 @@ class SizeofVarNode(SizeofNode):
         operand_as_type = self.operand.analyse_as_type(env)
         if operand_as_type:
             self.arg_type = operand_as_type
+            if self.arg_type.is_fused:
+                self.arg_type = self.arg_type.specialize(env.fused_to_specific)
             self.__class__ = SizeofTypeNode
             self.check_type()
         else:

tests/run/fused_types.pyx

@@ -242,3 +242,10 @@ def test_fused_declarations(cython.integral i, cython.floating f):
     print cython.typeof(squared_int)
     print cython.typeof(squared_float)
     print '%d %.2f' % (squared_int, squared_float)
+
+def test_sizeof_fused_type(fused_type1 b):
+    """
+    >>> test_sizeof_fused_type[pure_cython.double](11.1)
+    """
+    t = sizeof(b), sizeof(fused_type1), sizeof(double)
+    assert t[0] == t[1] == t[2], t