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return-rw
Combined from primary sources listed below.

In Control flow§

See primary documentation in context for return-rw.

The sub return will return values, not containers. Those are immutable and will lead to runtime errors when attempted to be mutated.

sub s(){ my $a = 41; return $a };
say ++s();
CATCH { default { say .^name, ': ', .Str } };
# OUTPUT: «X::Multi::NoMatch.new(dispatcher …

To return a mutable container, use return-rw.

sub s(){ my $a = 41; return-rw $a };
say ++s();
# OUTPUT: «42␤»

The same rules as for return regarding phasers and control exceptions apply.