diff --git a/src/builtin.cpp b/src/builtin.cpp
index 58cf00188..3b6aff970 100644
--- a/src/builtin.cpp
+++ b/src/builtin.cpp
@@ -489,9 +489,6 @@ void builtin_init() {
     }
 }
 
-/// Destroy builtin data.
-void builtin_destroy() {}
-
 /// Is there a builtin command with the given name?
 bool builtin_exists(const wcstring &cmd) { return static_cast<bool>(builtin_lookup(cmd)); }
 
diff --git a/src/builtin.h b/src/builtin.h
index 6f7e96d11..58434d7fa 100644
--- a/src/builtin.h
+++ b/src/builtin.h
@@ -76,7 +76,6 @@ enum { COMMAND_NOT_BUILTIN, BUILTIN_REGULAR, BUILTIN_FUNCTION };
 #define FG_MSG _(L"Send job %d, '%ls' to foreground\n")
 
 void builtin_init();
-void builtin_destroy();
 bool builtin_exists(const wcstring &cmd);
 
 int builtin_run(parser_t &parser, const wchar_t *const *argv, io_streams_t &streams);
diff --git a/src/event.cpp b/src/event.cpp
index 5b8ea051d..12e8c8d54 100644
--- a/src/event.cpp
+++ b/src/event.cpp
@@ -448,10 +448,6 @@ void event_fire(const event_t *event) {
     }
 }
 
-void event_init() {}
-
-void event_destroy() { s_event_handlers.clear(); }
-
 void event_fire_generic(const wchar_t *name, wcstring_list_t *args) {
     CHECK(name, );
 
diff --git a/src/event.h b/src/event.h
index c08f9866e..6133cfe16 100644
--- a/src/event.h
+++ b/src/event.h
@@ -125,12 +125,6 @@ void event_fire(const event_t *event);
 /// May be called from signal handlers
 void event_fire_signal(int signal);
 
-/// Initialize the event-handling library.
-void event_init();
-
-/// Destroy the event-handling library.
-void event_destroy();
-
 /// Returns a string describing the specified event.
 wcstring event_get_desc(const event_t &e);
 
diff --git a/src/fish.cpp b/src/fish.cpp
index 9963017d3..4f6035a73 100644
--- a/src/fish.cpp
+++ b/src/fish.cpp
@@ -376,11 +376,9 @@ int main(int argc, char **argv) {
     const struct config_paths_t paths = determine_config_directory_paths(argv[0]);
     env_init(&paths);
     proc_init();
-    event_init();
     builtin_init();
     misc_init();
     reader_init();
-    history_init();
 
     parser_t &parser = parser_t::principal_parser();
 
@@ -448,11 +446,8 @@ int main(int argc, char **argv) {
         parser.emit_profiling(s_profiling_output_filename);
     }
 
-    history_destroy();
+    history_save_all();
     proc_destroy();
-    builtin_destroy();
-    reader_destroy();
-    event_destroy();
     exit_without_destructors(exit_status);
     return EXIT_FAILURE;  // above line should always exit
 }
diff --git a/src/fish_key_reader.cpp b/src/fish_key_reader.cpp
index 00c06276f..aec1626be 100644
--- a/src/fish_key_reader.cpp
+++ b/src/fish_key_reader.cpp
@@ -299,7 +299,6 @@ static void setup_and_process_keys(bool continuous_mode) {
     restore_term_mode();
     restore_term_foreground_process_group();
     input_destroy();
-    reader_destroy();
 }
 
 static bool parse_debug_level_flag() {
diff --git a/src/fish_tests.cpp b/src/fish_tests.cpp
index d11a33b47..3ec041cba 100644
--- a/src/fish_tests.cpp
+++ b/src/fish_tests.cpp
@@ -4412,7 +4412,6 @@ int main(int argc, char **argv) {
     set_main_thread();
     setup_fork_guards();
     proc_init();
-    event_init();
     builtin_init();
     env_init();
     misc_init();
@@ -4478,9 +4477,6 @@ int main(int argc, char **argv) {
     say(L"Encountered %d errors in low-level tests", err_count);
     if (s_test_run_count == 0) say(L"*** No Tests Were Actually Run! ***");
 
-    reader_destroy();
-    builtin_destroy();
-    event_destroy();
     proc_destroy();
 
     if (err_count != 0) {
diff --git a/src/function.h b/src/function.h
index 95957a90b..514a3e65a 100644
--- a/src/function.h
+++ b/src/function.h
@@ -63,9 +63,6 @@ class function_info_t {
                     bool autoload);
 };
 
-/// Initialize function data.
-void function_init();
-
 /// Add a function. definition_line_offset is the line number of the function's definition within
 /// its source file.
 void function_add(const function_data_t &data, const parser_t &parser,
diff --git a/src/history.cpp b/src/history.cpp
index 190208eaa..7fea40694 100644
--- a/src/history.cpp
+++ b/src/history.cpp
@@ -1836,8 +1836,6 @@ void history_t::incorporate_external_changes() {
     }
 }
 
-void history_init() {}
-
 void history_collection_t::save() {
     // Save all histories
     auto &&h = histories.acquire();
@@ -1846,11 +1844,7 @@ void history_collection_t::save() {
     }
 }
 
-void history_destroy() { histories.save(); }
-
-void history_sanity_check() {
-    // No sanity checking implemented yet...
-}
+void history_save_all() { histories.save(); }
 
 /// Return the prefix for the files to be used for command and read history.
 wcstring history_session_id() {
diff --git a/src/history.h b/src/history.h
index da5ec154a..9b411689a 100644
--- a/src/history.h
+++ b/src/history.h
@@ -358,15 +358,8 @@ class history_search_t {
         : history(), term(), search_type(HISTORY_SEARCH_TYPE_CONTAINS), case_sensitive(true) {}
 };
 
-/// Init history library. The history file won't actually be loaded until the first time a history
-/// search is performed.
-void history_init();
-
 /// Saves the new history to disk.
-void history_destroy();
-
-/// Perform sanity checks.
-void history_sanity_check();
+void history_save_all();
 
 /// Return the prefix for the files to be used for command and read history.
 wcstring history_session_id();
diff --git a/src/reader.cpp b/src/reader.cpp
index 6c86c786d..dac8acd2d 100644
--- a/src/reader.cpp
+++ b/src/reader.cpp
@@ -803,8 +803,6 @@ void reader_init() {
     get_current_winsize();
 }
 
-void reader_destroy() { pthread_key_delete(generation_count_key); }
-
 /// Restore the term mode if we own the terminal. It's important we do this before
 /// restore_foreground_process_group, otherwise we won't think we own the terminal.
 void restore_term_mode() {
diff --git a/src/reader.h b/src/reader.h
index b38ec0454..fe0776907 100644
--- a/src/reader.h
+++ b/src/reader.h
@@ -58,9 +58,6 @@ void reader_sanity_check();
 /// Initialize the reader.
 void reader_init();
 
-/// Destroy and free resources used by the reader.
-void reader_destroy();
-
 /// Restore the term mode at startup.
 void restore_term_mode();
 
diff --git a/src/sanity.cpp b/src/sanity.cpp
index b5c803304..37eeaafee 100644
--- a/src/sanity.cpp
+++ b/src/sanity.cpp
@@ -20,7 +20,6 @@ void sanity_lose() {
 }
 
 bool sanity_check() {
-    if (!insane && shell_is_interactive()) history_sanity_check();
     if (!insane) reader_sanity_check();
     if (!insane) kill_sanity_check();
     if (!insane) proc_sanity_check();