https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69774

TC <rs2740 at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |rs2740 at gmail dot com

--- Comment #2 from TC <rs2740 at gmail dot com> ---
You have a dangling reference - the lambda in Thread's constructor captures
`task` by reference, and in this case `task` is bound to the temporary object
created by the lambda expression in A's constructor, which is immediately
destroyed at the semicolon.

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