error test case for boolean cooercion of incompatible types

tests/errors/e_boolcoerce.pyx

+ctypedef struct struct_type_not_boolean:
+    int i
+    float f
+
+if struct_type_not_boolean:
+    print("INVALID CODE")
+
+cdef struct struct_not_boolean:
+    int i
+    float f
+
+if struct_not_boolean:
+    print("INVALID CODE")
+
+ctypedef union union_type_not_boolean:
+    int i
+    float f
+
+if union_type_not_boolean:
+    print("INVALID CODE")
+
+cdef union union_not_boolean:
+    int i
+    float f
+
+if union_not_boolean:
+    print("INVALID CODE")
+
+
+_ERRORS = u"""
+ 5:26: 'struct_type_not_boolean' is not a constant, variable or function identifier
+ 5:26: Type 'struct_type_not_boolean' not acceptable as a boolean
+
+12:21: 'struct_not_boolean' is not a constant, variable or function identifier
+12:21: Type 'struct_not_boolean' not acceptable as a boolean
+
+19:25: 'union_type_not_boolean' is not a constant, variable or function identifier
+19:25: Type 'union_type_not_boolean' not acceptable as a boolean
+
+26:20: 'union_not_boolean' is not a constant, variable or function identifier
+26:20: Type 'union_not_boolean' not acceptable as a boolean
+"""