This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 114a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2024-04-18

2668. co_await in a lambda-expression

[Accepted as a DR at the March, 2024 meeting.]

Subclause 7.6.2.4 [expr.await] paragraph 2 disallows an await-expression to appear in the body of a lambda-expression:

An await-expression shall appear only in a potentially-evaluated expression within the compound-statement of a function-body outside of a handler (14.1 [except.pre]). ...

This is probably unintended.

Proposed resolution (approved by CWG 2023-11-11):

Change in 7.6.2.4 [expr.await] paragraph 2 as follows:

An await-expression shall appear only in as a potentially-evaluated expression within the compound-statement of a function-body or lambda-expression, in either case outside of a handler (14.1 [except.pre]). ...