https://bugs.llvm.org/show_bug.cgi?id=43809

            Bug ID: 43809
           Summary: Missing unused variable and needless cast warning
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangb...@nondot.org
          Reporter: l...@alex.lanin.de
                CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
                    richard-l...@metafoo.co.uk

Given:
    struct S
    {
        S(int value)
        : m_value(value) {}

        int m_value;
    };

    void foo() {
      S x{S{10}};
      S y{10};
    }


When compiling with -Weverything, I would have expected:
- unused variable x (available)
- unused variable y (available only when making it constexpr)
- useless cast within x (missing)

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