while (1) {
     S;
     last if (B);
     T;
}

##</code><code>##

do {
     S;
} while (!B) {
     T;
}

##</code><code>##

do {
     S;
} while (!B);
# OR
while (!B) {
     T;
}

##</code><code>##

loop {
     S;
} while (!B) {
     T;
}