Exceptions not caught in gcc-4.3.0 program

[Visa Inquirer]

I compile the source exc.C:
--- begin source ---
#include <iostream>
#include <string>
using namespace std;
void fun();

int main() {
  try {
     throw string("Hi there!");
  }
  catch (string s) {
    cout << "Catched exception \"" << s << "\"\n";
  }
}
--- end source ---

With the command:
/usr/local/gcc-4.3.0/bin/g++ -ansi -Wall -o exc exc.C

And I get an output:
terminate called after throwing an instance of 'std::string'
terminate called recursively
Abort trap: 6

Exception is never caught.
What is wrong?
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