diff --git a/fish-rust/src/builtins/exit.rs b/fish-rust/src/builtins/exit.rs
index b0ffc0f77..8d8eed43b 100644
--- a/fish-rust/src/builtins/exit.rs
+++ b/fish-rust/src/builtins/exit.rs
@@ -2,7 +2,7 @@ use libc::c_int;
 
 use super::r#return::parse_return_value;
 use super::shared::io_streams_t;
-use crate::ffi::{parser_t, Repin};
+use crate::ffi::parser_t;
 use crate::wchar::wstr;
 
 /// Function for handling the exit builtin.
@@ -20,7 +20,7 @@ pub fn exit(
     // TODO: in concurrent mode this won't successfully exit a pipeline, as there are other parsers
     // involved. That is, `exit | sleep 1000` may not exit as hoped. Need to rationalize what
     // behavior we want here.
-    parser.pin().libdata().set_exit_current_script(true);
+    parser.libdata_pod().exit_current_script = true;
 
     return Some(retval);
 }
diff --git a/fish-rust/src/builtins/return.rs b/fish-rust/src/builtins/return.rs
index 650c73232..6d3f6c5c5 100644
--- a/fish-rust/src/builtins/return.rs
+++ b/fish-rust/src/builtins/return.rs
@@ -8,7 +8,7 @@ use super::shared::{
     BUILTIN_ERR_NOT_NUMBER, STATUS_CMD_OK, STATUS_INVALID_ARGS,
 };
 use crate::builtins::shared::BUILTIN_ERR_TOO_MANY_ARGUMENTS;
-use crate::ffi::{parser_t, Repin};
+use crate::ffi::parser_t;
 use crate::wchar::{wstr, L};
 use crate::wgetopt::{wgetopter_t, wopt, woption, woption_argument_t};
 use crate::wutil::fish_wcstoi;
@@ -79,14 +79,15 @@ pub fn r#return(
 
     // If we're not in a function, exit the current script (but not an interactive shell).
     if !has_function_block {
-        if !parser.is_interactive() {
-            parser.pin().libdata().set_exit_current_script(true);
+        let ld = parser.libdata_pod();
+        if !ld.is_interactive {
+            ld.exit_current_script = true;
         }
         return Some(retval);
     }
 
     // Mark a return in the libdata.
-    parser.pin().libdata().set_returning(true);
+    parser.libdata_pod().returning = true;
 
     return Some(retval);
 }
diff --git a/fish-rust/src/ffi.rs b/fish-rust/src/ffi.rs
index fae6a8d99..1d005a102 100644
--- a/fish-rust/src/ffi.rs
+++ b/fish-rust/src/ffi.rs
@@ -47,6 +47,7 @@ include_cpp! {
     generate!("job_t")
     generate!("process_t")
     generate!("library_data_t")
+    generate_pod!("library_data_pod_t")
 
     generate!("proc_wait_any")
 
@@ -80,6 +81,12 @@ impl parser_t {
         let ffi_jobs = self.ffi_jobs();
         unsafe { slice::from_raw_parts(ffi_jobs.jobs, ffi_jobs.count) }
     }
+
+    pub fn libdata_pod(&mut self) -> &mut library_data_pod_t {
+        let libdata = self.pin().ffi_libdata_pod();
+
+        unsafe { &mut *libdata }
+    }
 }
 
 impl job_t {
diff --git a/src/parser.cpp b/src/parser.cpp
index d43f16255..e67f89120 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -39,14 +39,6 @@ static wcstring user_presentable_path(const wcstring &path, const environment_t
     return replace_home_directory_with_tilde(path, vars);
 }
 
-void library_data_t::set_exit_current_script(bool val) {
-    exit_current_script = val;
-};
-
-void library_data_t::set_returning(bool val) {
-    returning = val;
-};
-
 parser_t::parser_t(std::shared_ptr<env_stack_t> vars, bool is_principal)
     : variables(std::move(vars)), is_principal_(is_principal) {
     assert(variables.get() && "Null variables in parser initializer");
@@ -497,6 +489,8 @@ job_t *parser_t::job_get_from_pid(pid_t pid) const {
     return nullptr;
 }
 
+library_data_pod_t *parser_t::ffi_libdata_pod() { return &library_data; }
+
 profile_item_t *parser_t::create_profile_item() {
     if (g_profiling_active) {
         profile_items.emplace_back();
diff --git a/src/parser.h b/src/parser.h
index 9381426ab..97466a136 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -146,8 +146,8 @@ struct profile_item_t {
 
 class parse_execution_context_t;
 
-/// Miscellaneous data used to avoid recursion and others.
-struct library_data_t {
+/// Plain-Old-Data components of `struct library_data_t` that can be shared over FFI
+struct library_data_pod_t {
     /// A counter incremented every time a command executes.
     uint64_t exec_count{0};
 
@@ -207,7 +207,10 @@ struct library_data_t {
 
     /// The read limit to apply to captured subshell output, or 0 for none.
     size_t read_limit{0};
+};
 
+/// Miscellaneous data used to avoid recursion and others.
+struct library_data_t : public library_data_pod_t {
     /// The current filename we are evaluating, either from builtin source or on the command line.
     filename_ref_t current_filename{};
 
@@ -231,9 +234,6 @@ struct library_data_t {
         /// Used to get the full text of the current job for `status current-commandline`.
         wcstring commandline;
     } status_vars;
-
-    void set_exit_current_script(bool val);
-    void set_returning(bool val);
 };
 
 /// The result of parser_t::eval family.
@@ -486,6 +486,7 @@ class parser_t : public std::enable_shared_from_this<parser_t> {
 
     /// autocxx junk.
     RustFFIJobList ffi_jobs() const;
+    library_data_pod_t *ffi_libdata_pod();
 
     /// autocxx junk.
     bool ffi_has_funtion_block() const;