refactor(library/token_set): move to frontends/lean

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/frontends/lean/CMakeLists.txt

@@ -1,2 +1,2 @@
-add_library(lean_frontend register_module.cpp)
+add_library(lean_frontend register_module.cpp token_set.cpp)
 target_link_libraries(lean_frontend ${LEAN_LIBS})

src/frontends/lean/token_set.cpp

@@ -4,7 +4,8 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 Author: Leonardo de Moura
 */
-#include "library/token_set.h"
+#include <utility>
+#include "frontends/lean/token_set.h"
 
 namespace lean {
 token_set add_command_token(token_set const & s, char const * token) {

src/library/CMakeLists.txt

@@ -3,7 +3,7 @@ add_library(library deep_copy.cpp expr_lt.cpp io_state.cpp occurs.cpp
   resolve_macro.cpp kernel_serializer.cpp max_sharing.cpp
   normalize.cpp shared_environment.cpp module.cpp coercion.cpp
   private.cpp placeholder.cpp aliases.cpp scope.cpp level_names.cpp
-  update_declaration.cpp token_set.cpp)
+  update_declaration.cpp)
 # fo_unify.cpp hop_match.cpp)
 
 target_link_libraries(library ${LEAN_LIBS})