clang/test/Parser/cxx2a-inline-nested-namespace-definition.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++14
   2 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++17
   3 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++20 -Wc++17-compat
   4
   5 namespace inline foo1::foo2::foo3 { // expected-error {{expected identifier or '{'}} expected-error {{use of undeclared identifier 'foo1'}}
   6 }
   7
   8 inline namespace foo4::foo5::foo6 { // expected-error {{nested namespace definition cannot be 'inline'}}}
   9 }
  10
  11 #if __cplusplus <= 201402L
  12 // expected-warning@+7 {{nested namespace definition is a C++17 extension; define each namespace separately}}
  13 // expected-warning@+6 {{inline nested namespace definition is a C++20 extension}}
  14 #elif __cplusplus <= 201703L
  15 // expected-warning@+4 {{inline nested namespace definition is a C++20 extension}}
  16 #else
  17 // expected-warning@+2 {{inline nested namespace definition is incompatible with C++ standards before C++20}}
  18 #endif
  19 namespace valid1::valid2::inline valid3::inline valid4::valid5 {}
  20 // expected-note@-1 4 {{previous definition is here}}
  21
  22 #if __cplusplus <= 201402L
  23 // expected-warning@+3 {{nested namespace definition is a C++17 extension; define each namespace separately}}
  24 #endif
  25 //expected-warning@+1 2 {{inline namespace reopened as a non-inline namespace}}
  26 namespace valid1::valid2::valid3::valid4::valid5 {}
  27
  28 #if __cplusplus <= 201402L
  29 // expected-warning@+7 {{nested namespace definition is a C++17 extension; define each namespace separately}}
  30 // expected-warning@+6 {{inline nested namespace definition is a C++20 extension}}
  31 #elif __cplusplus <= 201703L
  32 // expected-warning@+4 {{inline nested namespace definition is a C++20 extension}}
  33 #else
  34 // expected-warning@+2 {{inline nested namespace definition is incompatible with C++ standards before C++20}}
  35 #endif
  36 namespace valid1::valid2::inline valid3::inline valid4::valid5 {}
  37
  38 namespace valid1 {
  39 namespace valid2 {
  40 //expected-warning@+1 {{inline namespace reopened as a non-inline namespace}}
  41 namespace valid3 {
  42 //expected-warning@+1 {{inline namespace reopened as a non-inline namespace}}
  43 namespace valid4 {
  44 namespace valid5 {
  45 }
  46 } // namespace valid4
  47 } // namespace valid3
  48 } // namespace valid2
  49 } // namespace valid1
  50