Fix issue 17661: isInputRange should work with .front that returns re…

…ference to parameter.
dlang · Aug 10, 2017 · be9ad6a · be9ad6a
1 parent e99cf38
commit be9ad6a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/std/range/primitives.d b/std/range/primitives.d
@@ -164,7 +164,7 @@ Returns:
 enum bool isInputRange(R) =
     is(typeof(R.init) == R)
     && is(ReturnType!((R r) => r.empty) == bool)
-    && is(typeof((R r) => r.front))
+    && is(typeof((return ref R r) => r.front))
     && !is(ReturnType!((R r) => r.front) == void)
     && is(typeof((R r) => r.popFront));