clang/test/SemaCXX/fold_expr_typo.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++17 %s
   2
   3 template <typename... T>
   4 void foo(T &&...Params) {
   5   foo<T>(Unknown); // expected-error {{expression contains unexpanded parameter pack 'T'}}\
   6                       expected-error {{use of undeclared identifier 'Unknown'}}
   7   ((foo<T>(Unknown)), ...); // expected-error {{use of undeclared identifier 'Unknown'}}
   8 }
   9
  10 template <typename... U> struct A {
  11   template <typename... T> void foo(T &&...Params) {
  12     foo<T>((... + static_cast<U>(1))); // expected-error {{expression contains unexpanded parameter pack 'T'}}
  13   }
  14 };