https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109850
--- Comment #2 from Paul Smith <psmith at gnu dot org> --- I don't know if this is of any use but I ran under valgrind and get this result: ==3019683== Command: /data/src/build/x86_64-linux/cc/unknown/bin/../libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus -fpreprocessed LocalStorage.i -quiet -dumpbase LocalStorage.i -dumpbase-ext .i -m64 -mtune=generic -march=x86-64 -o /tmp/ccaQvBYi.s ==3019683== ==3019683== Invalid read of size 4 ==3019683== at 0x7B5503: ??? (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1390609: walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*)) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1390A11: walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*)) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x148A6C3: ??? (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1390609: walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*)) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x13906DD: walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*)) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1390730: walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*)) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x139096F: walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*)) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1484986: check_for_bare_parameter_packs(tree_node*, unsigned int) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x157004A: finish_expr_stmt(tree_node*) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1689186: tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== by 0x1689087: tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) (in /data/src/build/x86_64-linux/cc/unknown/libexec/gcc/x86_64-unknown-linux-gnu/12.3.0/cc1plus) ==3019683== Address 0x5c is not stack'd, malloc'd or (recently) free'd ==3019683==
