can anybody explain why the following code aborts with an error

irb(main):186:0> print ((1..10).collect do |x| x**2 end)
SyntaxError: (irb):186: syntax error, unexpected keyword_do_block,
expecting ')'
print ((1..10).collect do |x| x**2 end)
                         ^
(irb):186: syntax error, unexpected keyword_end, expecting $end
print ((1..10).collect do |x| x**2 end)
                                      ^
        from /usr/bin/irb:12:in `<main>'

whereas following code with the same functionality works as expected ?

irb(main):187:0> print ((1..10).collect { |x| x**2 })
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]=> nil

I did believed curly-braces "{ }" can substitute "do end" arbitrarily at block definition.

I know I can "fix" the first call by omitting a space between print method and the first parenthesis, but I'm interested in an explanation why it behaves different.

ruby block
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