Handle ineffectual assignments

Removed ineffectual assignments.

assert/assertions.go

@@ -104,11 +104,11 @@ the problem actually occurred in calling code.*/
 // failed.
 func CallerInfo() []string {
 
-	pc := uintptr(0)
-	file := ""
-	line := 0
-	ok := false
-	name := ""
+	var pc uintptr
+	var ok bool
+	var file string
+	var line int
+	var name string
 
 	callers := []string{}
 	for i := 0; ; i++ {

mock/mock_test.go

@@ -1325,6 +1325,7 @@ func Test_Arguments_Diff_WithArgMatcher(t *testing.T) {
 	assert.Contains(t, diff, `(bool=false) not matched by func(int) bool`)
 
 	diff, count = args.Diff([]interface{}{"string", 123, false})
+	assert.Equal(t, 1, count)
 	assert.Contains(t, diff, `(int=123) matched by func(int) bool`)
 
 	diff, count = args.Diff([]interface{}{"string", 123, true})