Suppress a couple more warnings.

tests/compile/cdef_syntax.pyx

@@ -9,3 +9,6 @@ cdef no_semi():
 
 cdef with_semi():
     cdef int i;
+
+def use_cdef():
+  &no_semi, &with_semi

tests/compile/cnamespec.pyx

@@ -14,6 +14,7 @@ cdef double spam "c_spam" (int i, float f):
     cdef double d "c_d"
     cdef foo *p
     global b
+    if i:
       d = spam(a, f)
     cdef foo q
     q.i = 7

tests/run/python_bool_type.pyx

@@ -132,18 +132,18 @@ def test_math():
     assertIs(0!=1, True)
     assertIs(0!=0, False)
 
-    x = [1]
-    assertIs(x is x, True)
-    assertIs(x is not x, False)
+    y = x = [1]
+    assertIs(x is y, True)
+    assertIs(x is not y, False)
 
     assertIs(1 in x, True)
     assertIs(0 in x, False)
     assertIs(1 not in x, False)
     assertIs(0 not in x, True)
 
-    x = {1: 2}
-    assertIs(x is x, True)
-    assertIs(x is not x, False)
+    y = x = {1: 2}
+    assertIs(x is y, True)
+    assertIs(x is not y, False)
 
     assertIs(1 in x, True)
     assertIs(0 in x, False)