@@ -3688,7 +3688,22 @@ await_statement_walker (tree *stmt, int *do_subtree, void *d)
*do_subtree = 0;
return res;
}
- break;
+ break;
+ case HANDLER:
+ {
+ /* [expr.await] An await-expression shall appear only in a
+ potentially-evaluated expression within the compound-statement
+ of a function-body outside of a handler. */
+ tree *await_ptr;
+ hash_set<tree> visited;
+ if (!(cp_walk_tree (&HANDLER_BODY (expr), find_any_await,
+ &await_ptr, &visited)))
+ return NULL_TREE; /* All OK. */
+ location_t loc = EXPR_LOCATION (*await_ptr);
+ error_at (loc, "await expressions are not permitted in handlers");
+ return NULL_TREE; /* This is going to fail later anyway. */
+ }
+ break;
}
else if (EXPR_P (expr))
{
new file mode 100644
@@ -0,0 +1,25 @@
+#include <coroutine>
+
+struct task {
+ struct promise_type {
+ std::suspend_always initial_suspend();
+ std::suspend_always final_suspend() noexcept;
+ task get_return_object();
+ void return_void();
+ void unhandled_exception();
+ };
+};
+
+task
+my_coro ()
+{
+ try
+ { }
+ catch (...)
+ {
+ // [expr.await] An await-expression shall appear only in a potentially-
+ // evaluated expression within the compound-statement of a function-body
+ // outside of a handler
+ co_await std::suspend_always{}; // { dg-error "await expressions are not permitted in handlers" }
+ }
+}
Hi, C++20 [expr.await] / 2 An await-expression shall appear only in a potentially-evaluated expression within the compound-statement of a function-body outside of a handler. tested on x86_64, powerpc64le-linux, x86_64-darwin, cppcoro and folly, pushed to master as obvious, thanks Iain Signed-off-by: Iain Sandoe <iain@sandoe.co.uk> PR c++/99710 gcc/cp/ChangeLog: * coroutines.cc (await_statement_walker): Report an error if an await expression is found in a handler body. gcc/testsuite/ChangeLog: * g++.dg/coroutines/pr99710.C: New test. --- gcc/cp/coroutines.cc | 17 ++++++++++++++- gcc/testsuite/g++.dg/coroutines/pr99710.C | 25 +++++++++++++++++++++++ 2 files changed, 41 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/coroutines/pr99710.C