diff --git a/fec/src/own.h b/fec/src/own.h
index eb0ff65..830341f 100644
--- a/fec/src/own.h
+++ b/fec/src/own.h
@@ -13,7 +13,80 @@ enum FeOwnMoveState {
     FE_OWN_MAYBE_MOVED = 2
 };
 
+typedef enum FeOwnAccessKind {
+    FE_OWN_READ,
+    FE_OWN_WRITE,
+    FE_OWN_MOVE,
+    FE_OWN_BORROW_SHARED,
+    FE_OWN_BORROW_MUT,
+    FE_OWN_PROJECTION
+} FeOwnAccessKind;
+
+typedef enum FeOwnProvenanceKind {
+    FE_OWN_PROV_INVALID,
+    FE_OWN_PROV_STATIC,
+    FE_OWN_PROV_PARAM
+} FeOwnProvenanceKind;
+
+typedef struct FeOwnPlace {
+    FeNode *root;
+    const char *root_cname;
+    int projected;
+} FeOwnPlace;
+
+typedef struct FeOwnState {
+    int move;
+    int initialized;
+    unsigned shared;
+    int exclusive;
+    int borrow_conflict;
+    FeLoc move_loc;
+    FeLoc borrow_loc;
+} FeOwnState;
+
+typedef struct FeOwnProvenance {
+    FeOwnProvenanceKind kind;
+    unsigned param_index;
+} FeOwnProvenance;
+
+typedef struct FeOwnLastUse {
+    const char *cname;
+    FeNode *decl;
+    FeNode *last_node;
+    unsigned long last_ordinal;
+    int defer_extended;
+} FeOwnLastUse;
+
+typedef struct FeOwnLiveness {
+    FeArena *arena;
+    FeOwnLastUse *items;
+    unsigned count;
+    unsigned capacity;
+    unsigned long ordinal;
+} FeOwnLiveness;
+
 int fe_own_is_copy_type(FeType *type);
+int fe_own_is_reference_like(FeType *type);
+int fe_own_place_from_expr(FeNode *expr, FeOwnPlace *place);
+
+void fe_own_state_init(FeOwnState *state, int initialized);
+int fe_own_access(FeDiags *diags, FeOwnState *state,
+                  FeOwnAccessKind access, FeLoc loc);
+void fe_own_release_shared(FeOwnState *state);
+void fe_own_release_exclusive(FeOwnState *state);
+FeOwnState fe_own_merge_state(FeOwnState left, FeOwnState right);
+int fe_own_state_equal(const FeOwnState *left, const FeOwnState *right);
+
+FeOwnProvenance fe_own_provenance_static(void);
+FeOwnProvenance fe_own_provenance_param(unsigned param_index);
+FeOwnProvenance fe_own_merge_provenance(FeOwnProvenance left,
+                                        FeOwnProvenance right);
+
+void fe_own_liveness_init(FeOwnLiveness *live, FeArena *arena);
+int fe_own_collect_last_uses(FeOwnLiveness *live, FeNode *fn);
+const FeOwnLastUse *fe_own_last_use(const FeOwnLiveness *live,
+                                    const char *cname);
+
 void fe_own_mark_consumed(FeDiags *diags, int *state, FeNode *decl,
                           FeNode *expr, FeType *type, int in_defer);
 void fe_own_check_use(FeDiags *diags, int state, FeLoc loc);