[llvm-bugs] [Bug 50438] New: Warn when assigning to temporary

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50438

            Bug ID: 50438
           Summary: Warn when assigning to temporary
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: davidfromonline at gmail.com
                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

I would like for there to be a warning that warns for the following code:

```
struct s {};

inline void f() {
        s() = s();
}
```

I know that for a given type, I can prevent this from compiling if I give `s`
an lvalue-refererence-qualified assignment operator, but that requires writing
two assignment operators and two (sometimes three) constructors to get the
behavior I get today from not typing anything, and I have to apply it to every
type. It would be much nicer if I could just turn on a warning for this.

I don't know where this warning would belong in terms of `Wall` `Wextra` or
just `Weverything`. The only valid use case is if your assignment operator has
a side effect that you want.

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