llvm-project/clang-tools-extra/test/clang-tidy/misc-unused-alias-decls.cpp

// RUN: %check_clang_tidy %s misc-unused-alias-decls %t

namespace my_namespace {
class C {};
}

namespace unused_alias = ::my_namespace; // eol-comments aren't removed (yet)
// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: namespace alias decl 'unused_alias' is unused
// CHECK-FIXES: {{^}}// eol-comments aren't removed (yet)

namespace used_alias = ::my_namespace;
void f() { used_alias::C c; }