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do (statement prefix)
Combined from primary sources listed below.

In Statement prefixes§

See primary documentation in context for do.

do can be used as a statement prefix to disambiguate the statement they precede; this is needed, for instance, if you want to assign the result of a for statement. A bare for will fail, but this will work:

my $counter = 0;
my $result = do for ^5 { $counter++ };
say $counter; # OUTPUT: «5␤»
say $result;  # OUTPUT: «(0 1 2 3 4)␤»

do is equivalent, as in other cases, to surrounding a statement with a parenthesis. It can be used as an alternative with a (possibly more) straightforward syntax.