for or while on one line with the
condition and the loop keyword.
for J in S'Range loop ... end loop;
If the condition is too long, split the condition (see ‘If
statements’ above) and align loop with the for or
while keyword.
while long_condition_that_has_to_be_split and then continued_on_the_next_line loop ... end loop;
If the loop_statement has an identifier, it is laid out as follows:
Outer : while not condition loop ... end Outer;