problem with pragma vector

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//******************************************************************************
// MSP430F543xA Demo - USCI_A0, Ultra-Low Pwr UART 9600 Echo ISR, 32kHz ACLK
//
// Description: Echo a received character, RX ISR used. Normal mode is LPM3,
// USCI_A0 RX interrupt triggers TX Echo.
// ACLK = REFO = 32768Hz, MCLK = SMCLK = DCO ~1.045MHz
// Baud rate divider with 32768Hz XTAL @9600 = 32768Hz/9600 = 3.41
// See User Guide for baud rate divider table
//
// MSP430F5438A
// -----------------
// /|\| |
// | | |
// --|RST |
// | |
// | P3.4/UCA0TXD|------------>
// | | 9600 - 8N1
// | P3.5/UCA0RXD|<------------
//
// M. Morales
// Texas Instruments Inc.
// June 2009
// Built with CCE Version: 3.2.2 and IAR Embedded Workbench Version: 4.11B
//******************************************************************************

#include <msp430.h>

int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT


P3SEL = 0x30; // P3.4,5 = USCI_A0 TXD/RXD
UCA0CTL1 |= UCSWRST; // **Put state machine in reset**
UCA0CTL1 |= UCSSEL_1; // CLK = ACLK
UCA0BR0 = 0x03; // 32kHz/9600=3.41 (see User's Guide)
UCA0BR1 = 0x00; //
UCA0MCTL = UCBRS_3+UCBRF_0; // Modulation UCBRSx=3, UCBRFx=0
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt

// __bis_SR_register(LPM3_bits + GIE); // Enter LPM3, interrupts enabled
__no_operation(); // For debugger
}

// Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
{
P1DIR |= 0x01;
for (;;)
{
volatile unsigned int i; // volatile to prevent optimization

P1OUT ^= 0x01; // Toggle P1.0 using exclusive-OR

i = 10000; // SW Delay
do i--;
while (i != 0);
}
}

we are unable to see the blinking LED program with pragma vector.