why destructor called exception?

i approaching a::~a() called program, nonetheless isn't:

#include <iostream>

struct {
  ~a() { std::cout << "~a()" << std::endl; }
};

void f() {
  a;
  pitch "spam";
}

int main() { f(); }

however, i change final line

int main() try { f(); } locate (...) { throw; }

then a::~a() is called.

i am compiling "microsoft (r) 32-bit c/c++ optimizing compiler chronicle 14.00.50727.762 80x86" visible studio 2005. management line cl /eha my.cpp.

is compiler right usual? does customary contend matter?