This ICE was caused by dereferencing the wrong pointer and not finding
the expected thing there. Pointers are like that.
PR c++/99071
gcc/cp/
* name-lookup.c (maybe_record_mergeable_decl): Deref the correct
pointer.
gcc/testsuite/
* g++.dg/modules/pr99071_a.H: New.
* g++.dg/modules/pr99071_b.H: New.
--
Nathan Sidwell
diff --git c/gcc/cp/name-lookup.c w/gcc/cp/name-lookup.c
index 5aa206d40d4..fda987e9616 100644
--- c/gcc/cp/name-lookup.c
+++ w/gcc/cp/name-lookup.c
@@ -3525,7 +3525,7 @@ maybe_record_mergeable_decl (tree *slot, tree name, tree decl)
if (!partition)
{
binding_slot &orig
- = BINDING_VECTOR_CLUSTER (*gslot, 0).slots[BINDING_SLOT_CURRENT];
+ = BINDING_VECTOR_CLUSTER (*slot, 0).slots[BINDING_SLOT_CURRENT];
if (!STAT_HACK_P (tree (orig)))
orig = stat_hack (tree (orig));
diff --git c/gcc/testsuite/g++.dg/modules/pr99071_a.H w/gcc/testsuite/g++.dg/modules/pr99071_a.H
new file mode 100644
index 00000000000..44bc7c43601
--- /dev/null
+++ w/gcc/testsuite/g++.dg/modules/pr99071_a.H
@@ -0,0 +1,6 @@
+// PR 99071 ICE with global-module merging
+// { dg-additional-options -fmodule-header }
+// { dg-module-cmi {} }
+
+template<typename T>
+void begin (T *);
diff --git c/gcc/testsuite/g++.dg/modules/pr99071_b.H w/gcc/testsuite/g++.dg/modules/pr99071_b.H
new file mode 100644
index 00000000000..1c773d74f12
--- /dev/null
+++ w/gcc/testsuite/g++.dg/modules/pr99071_b.H
@@ -0,0 +1,8 @@
+// PR 99071 ICE with global-module merging
+// { dg-additional-options -fmodule-header }
+// { dg-module-cmi {} }
+
+import "pr99071_a.H";
+
+template<typename T>
+void begin(T &);
