Actually, one of the major disappointments I have with Perl6 is the continued distinction between subs and blocks. Personally, I think that blocks should be first class entities in their own right.

If you assigned a block to a variable, it would become a named subroutine.

my $sub = {
    ## do stuff
};

my $result = $sub();
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if, [while, for etc. would be methods called on the block:

{
    #do stuff
}.if( cond );

.if( cond ) { ## indirect object form
    ## do stuff
} 

.while( cond ) {
    ## do stuff
}

.for $a -> ( 0 .. 10 ) {
    ##do stuff
}
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