[llvm-bugs] [Bug 45843] New: please report invalid use of placement new

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45843

            Bug ID: 45843
           Summary: please report invalid use of placement new
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: msan
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael at espindo.la
                CC: llvm-bugs at lists.llvm.org

Created attachment 23465
  --> https://bugs.llvm.org/attachment.cgi?id=23465&action=edit
testcase

As far as I can tell, basic.life makes this code illegal

new (&x) X(std::move(x));

No one would write that directly, but I have hit that with std::swap(x,x) and a
move assignment operator that was using the move constructor.

The attached file is a case where it would be nice to get a warning. It is the
same testcase given to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94992

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