fixed unique_args tests

src/build/app/mod.rs

@@ -1590,11 +1590,6 @@ impl<'a, 'b> App<'a, 'b> {
     // Perform expensive assertions on the Arg instance
     fn _arg_debug_asserts(&self, a: &Arg) -> bool {
         debugln!("App::_arg_debug_asserts:{}", a.name);
-        // No naming conflicts
-        assert!(
-            arg_names!(self).fold(0, |acc, n| if n == a.name { acc + 1 } else { acc }) < 2,
-            format!("Non-unique argument name: {} is already in use", a.name)
-        );
 
         // Long conflicts
         if let Some(l) = a.long {

src/mkeymap.rs

@@ -48,6 +48,7 @@ where
                 .map(|&x| (x, &self.value_index[x]))
                 .find(|(_i, x)| x == &&value)
         }) {
+            debug_assert!(false, "Non-unique value found");
             index = idx;
         } else {
             self.value_index.push(value);