[Bug c++/58107] New: missing destructor call after thrown exception in lambda capture

[mmehlich at semanticdesigns dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58107

            Bug ID: 58107
           Summary: missing destructor call after thrown exception in
                    lambda capture
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mmehlich at semanticdesigns dot com

Code:

extern "C" int printf(const char *,...);

struct A {
    A() { printf("A()\n"); }
    A(const A&) { printf("A(const A&)\n"); }
    ~A() { printf("~A()\n"); }
    operator int() const;
};
struct B {
    B() { printf("B()\n"); }
    B(const B&) { printf("B(const B&)\n"); }
    ~B() { printf("~B()\n"); }
    operator int() const;
};

int main() {
    A a;
    B b;
    try { auto lll ( [a,c = (throw 7, 9),b]()->int { return a+c+b; } ); // gcc
doesn't destroy copy-captured a...
    } catch (...) {
    }
};

Compile command line:
  gcc -std=c++1y lambda.cpp -lstdc++

Actual output:
  A()
  B()
  A(const A&)
  ~B()
  ~A()

Expected output:
  A()
  B()
  A(const A&)
  ~A()
  ~B()
  ~A()

The destructor call for the copy captured a is missing.