f20999da62
Turns out we want the backtrack triggering effects to have priority. Consider the following test case.
process main {
backtrack_point() pointA;
println("A");
sleep("1");
If ("true") {
backtrack_point() pointB;
println("B");
pointA->rgo();
pointB->go();
};
}
The result of this would originally have been "A B B B B...". The reason is that the If process would be caught in an infinite loop, and the main process would never get a chance to backtrack past the If statement. With this change, the result is "A B A B...", since the rgo() deinitialization immediately causes backtracking in main.
This is actually a nice example about a design bug regarding the subtle ways in which a process call (If, in this case) is not equivalent to embedding the statements in place. Without the If, there would not be an infinite loop in any case.
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