Function: breakpoint
Section: programming/control
C-Name: pari_breakpoint
Prototype: v
Help: breakpoint(): interrupt the program and enter the breakloop. The program
 continues when the breakloop is exited.
Doc: Interrupt the program and enter the breakloop. The program continues when
 the breakloop is exited.
 \bprog
 ? f(N,x)=my(z=x^2+1);breakpoint();gcd(N,z^2+1-z);
 ? f(221,3)
   ***   at top-level: f(221,3)
   ***                 ^--------
   ***   in function f: my(z=x^2+1);breakpoint();gcd(N,z
   ***                              ^--------------------
   ***   Break loop: type <Return> to continue; 'break' to go back to GP
 break> z
 10
 break>
 %2 = 13
 @eprog
