[Bug c++/66139] destructor not called for members of partially constructed anonymous struct/array

[ryxi at stu dot xidian.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66139

--- Comment #11 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
This happens for all TARGET_EXPRs with the third operand (cleanup expression),
as an INIT_EXPR's rhs.

The cleanup sequence are pushed in gimplify_target_expr, which doesn't
handle TARGET_EXPRs as the INIT_EXPRs' rhs.  So they just go missing.