see https://github.com/dlang/dlang.org/pull/2169#pullrequestreview-96041881 for context

segfault on:

+        $(SPEC_RUNNABLE_EXAMPLE_RUN
+        ---
+        size_t fun(T...)(T t, string file = __FILE__)
+        {
+            import std.stdio;
+            writeln(file, " ", t);
+            return T.length;
+        }
+        assert(fun(1, "foo") == 2);  // not 1 (IFTI)
+        assert(fun!int(1, "foo") == 1);  // IFTI
+        ---