clang/test/CXX/dcl.dcl/basic.namespace/namespace.def/p7.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 %s
   2
   3 // FIXME: We should probably suppress the warning on reopening an inline
   4 // namespace without the inline keyword if it's not the first opening of the
   5 // namespace in the file, because there's no risk of the inlineness differing
   6 // across TUs in that case.
   7
   8 namespace NIL {} // expected-note {{previous definition}}
   9 inline namespace NIL {} // expected-error {{cannot be reopened as inline}}
  10 inline namespace IL {} // expected-note {{previous definition}}
  11 namespace IL {} // expected-warning{{inline namespace reopened as a non-inline namespace}}
  12
  13 namespace {} // expected-note {{previous definition}}
  14 inline namespace {} // expected-error {{cannot be reopened as inline}}
  15 namespace X {
  16   inline namespace {} // expected-note {{previous definition}}
  17   namespace {} // expected-warning {{inline namespace reopened as a non-inline namespace}}
  18 }
  19
  20 namespace std {}
  21 inline namespace std {} // expected-error{{cannot declare the namespace 'std' to be inline}}
  22 inline namespace std::foo {} // expected-error{{cannot declare the namespace 'std' to be inline}}
  23                              // expected-error@-1{{nested namespace definition cannot be 'inline'}}
  24 namespace foo::inline std {} // expected-note {{previous definition}}
  25 namespace foo { inline namespace std {} } // OK
  26 namespace foo { namespace std {} } // expected-warning {{inline namespace reopened as a non-inline namespace}}