From fd97b84916c8741bc925aed53c6e9a8ed26e29f0 Mon Sep 17 00:00:00 2001
From: Mark Thom <markjordanthom@gmail.com>
Date: Sun, 23 Oct 2022 16:30:41 -0600
Subject: [PATCH] build partial strings using PStrLoc in write_term_to_heap
 (#1627)

---
 src/read.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/read.rs b/src/read.rs
index b4176c55..c8743c2f 100644
--- a/src/read.rs
+++ b/src/read.rs
@@ -390,6 +390,12 @@ impl<'a, 'b> TermWriter<'a, 'b> {
                     put_complete_string(self.heap, src.as_str(), self.atom_tbl);
                 }
                 &TermRef::PartialString(lvl, _, ref src, _) => {
+                    if let Level::Root = lvl {
+                        // Var tags can't refer directly to partial strings,
+                        // so a PStrLoc cell must be pushed.
+                        self.heap.push(pstr_loc_as_cell!(heap_loc + 1));
+                    }
+
                     allocate_pstr(self.heap, src.as_str(), self.atom_tbl);
 
                     let h = self.heap.len();
-- 
2.54.0