From 4c892d7b169345c44da346149d69a25946935560 Mon Sep 17 00:00:00 2001
From: Jerome Kelleher <jk@well.ox.ac.uk>
Date: Mon, 22 Sep 2025 17:01:34 +0100
Subject: [PATCH] POC

---
 c/tskit/tables.h | 4 ++++
 c/tskit/trees.c  | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/c/tskit/tables.h b/c/tskit/tables.h
index 204e39e2db..9dfe211cf8 100644
--- a/c/tskit/tables.h
+++ b/c/tskit/tables.h
@@ -158,6 +158,10 @@ typedef struct {
     /** @brief The ID of the edge that this mutation lies on, or TSK_NULL
       if there is no corresponding edge.*/
     tsk_id_t edge;
+    /** @brief Inherited state. */
+    const char *inherited_state;
+    /** @brief Size of the inherited state in bytes. */
+    tsk_size_t inherited_state_length;
 } tsk_mutation_t;
 
 /**
diff --git a/c/tskit/trees.c b/c/tskit/trees.c
index 4cf479c31f..156d48b27d 100644
--- a/c/tskit/trees.c
+++ b/c/tskit/trees.c
@@ -4951,6 +4951,8 @@ tsk_treeseq_get_mutation(
         goto out;
     }
     mutation->edge = self->site_mutations_mem[index].edge;
+    mutation->inherited_state = self->site_mutations_mem[index].inherited_state;
+    mutation->inherited_state_length = self->site_mutations_mem[index].inherited_state_length;
 out:
     return ret;
 }