can't call methods on the block result

[kt97679]

$ cat test.rb 
a = [11, 22].map do |x|
    x.to_s
end
puts(a.join)
$ ./tinyrb test.rb 
1122
$ cat test.rb                                                                                                                                                                                                                                        
a = [11, 22].map do |x|
    x.to_s
end.join
puts(a)
$ ./tinyrb test.rb 
SyntaxError: SyntaxError in test.rb at line 1 before text "a = [11, 22].map do |x|"
$