[Issue 17977] New: [scope] escaping reference to a temporary struct instance

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17977

          Issue ID: 17977
           Summary: [scope] escaping reference to a temporary struct
                    instance
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

The following code:

  struct List {
    Elem front() @safe return scope;
    ~this() @trusted scope;
    @disable this(this);
    void* data;
  }

  struct Elem {
    void* data;
  }

  void test() @safe {
    Elem elem;
    {
        // error: elem gets a pointer that has a lifetime limited to List()
        elem = List().front;
    }
  }

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