[llvm-bugs] [Bug 44003] New: False positive -Wreturn-stack-address warning with optional

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44003

            Bug ID: 44003
           Summary: False positive -Wreturn-stack-address warning with
                    optional
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rogero at howzatt.demon.co.uk
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The following code, with clang trunk and -std=c++17, produces a warning that I
believe to be a false positive.

---- code ----
#include <optional>
#include <string_view>

std::string_view foo()
{
    std::optional<std::string_view> sv("abc");
    return *sv; // unwanted [-Wreturn-stack-address] warning
}
---- code ----

See https://godbolt.org/z/vTs3Kk

This is a regression since clang 9.0

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