https://godbolt.org/z/WajPza5fM

void f(auto... args) {
  [] {
    try {} catch (decltype(args)) {}
  };
}

int main() {
  f(0);
}

<source>:3:19: internal compiler error: Segmentation fault
    3 |     try {} catch (decltype(args)) {}
      |                   ^~~~~~~~~~~~~~
0x1d00a79 internal_error(char const*, ...)
	???:0
0x98c0ff finish_decltype_type(tree_node*, bool, int)
	???:0
0x9170e3 tsubst(tree_node*, tree_node*, int, tree_node*)
	???:0
0x9177e7 tsubst(tree_node*, tree_node*, int, tree_node*)
	???:0
0x94acb2 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
	???:0
0x91d61f instantiate_decl(tree_node*, bool, bool)
	???:0
0x95f4eb instantiate_pending_templates(int)
	???:0
0x7ccff9 c_parse_final_cleanups()
	???:0
Please submit a full bug report,
with preprocessed source if appropriate.