[Bug c++/102217] co_awaiting a temporary produced by ternary operator crashes (double-free)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102217

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I also see the ICE on trunk (but not the release branches) so I suspect it's
related to --enable-checking 

cocrash.cxx: In function 'Co::Task<Foo> FooC(bool)':
cocrash.cxx:171:1: internal compiler error: in flatten_await_stmt, at
cp/coroutines.cc:2891
  171 | }
      | ^
0x6a8242 flatten_await_stmt
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:2891
0x9d7d57 flatten_await_stmt
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:2920
0x9d7d57 flatten_await_stmt
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:2920
0x9d9dee maybe_promote_temps
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3105
0x9d9dee await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3749
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x9d9f30 await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3420
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x9d975f await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3697
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x9da03c await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3409
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x9d9f30 await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3420
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x14b56dd 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11501
0x9d9f30 await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3420
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x9da03c await_statement_walker
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:3409
0x14b54d3 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*> >*))
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:11270
0x9db8e5 morph_fn_to_coro(tree_node*, tree_node**, tree_node**)
        /home/jwakely/src/gcc/gcc/gcc/cp/coroutines.cc:4496
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