Tested x86_64-pc-linux-gnu, applying to trunk.
-- 8< --
In this testcase, the tree walk to look for bare parameter packs was
confused by finding a type with no TREE_BINFO. But it should be fine that
it's unset; we already checked for unexpanded packs at parse time.
I also tried doing the partial instantiation of the local class, which is
probably the long-term direction we want to go, but for stage 4 let's go
with this safer change.
PR c++/109241
gcc/cp/ChangeLog:
* pt.cc (find_parameter_packs_r): Handle null TREE_BINFO.
gcc/testsuite/ChangeLog:
* g++.dg/cpp1y/lambda-generic-local-class2.C: New test.
---
gcc/cp/pt.cc | 12 ++++++++----
.../g++.dg/cpp1y/lambda-generic-local-class2.C | 13 +++++++++++++
2 files changed, 21 insertions(+), 4 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/cpp1y/lambda-generic-local-class2.C
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 90bcaa78701..40deedc9ba9 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -4069,10 +4069,14 @@ find_parameter_packs_r (tree *tp, int *walk_subtrees,
void* data)
case TAG_DEFN:
t = TREE_TYPE (t);
if (CLASS_TYPE_P (t))
- /* Local class, need to look through the whole definition. */
- for (tree bb : BINFO_BASE_BINFOS (TYPE_BINFO (t)))
- cp_walk_tree (&BINFO_TYPE (bb), &find_parameter_packs_r,
- ppd, ppd->visited);
+ {
+ /* Local class, need to look through the whole definition.
+ TYPE_BINFO might be unset for a partial instantiation. */
+ if (TYPE_BINFO (t))
+ for (tree bb : BINFO_BASE_BINFOS (TYPE_BINFO (t)))
+ cp_walk_tree (&BINFO_TYPE (bb), &find_parameter_packs_r,
+ ppd, ppd->visited);
+ }
else
/* Enum, look at the values. */
for (tree l = TYPE_VALUES (t); l; l = TREE_CHAIN (l))
diff --git a/gcc/testsuite/g++.dg/cpp1y/lambda-generic-local-class2.C
b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-local-class2.C
new file mode 100644
index 00000000000..83856de1f41
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-local-class2.C
@@ -0,0 +1,13 @@
+// PR c++/109241
+// { dg-do compile { target c++14 } }
+// { dg-options "" } no pedantic
+
+void g() {
+ [](auto) {
+ [](auto) {
+ ({
+ struct A {};
+ });
+ };
+ }(1);
+}
base-commit: cd0c433e5faba9a18f64881cd761a53a530aa798
--
2.31.1
