How to use hash inside instance_eval ruby?

Question

Here is the foo class

class Foo def initialize(&block) instance_eval(&block) if block end def bar(hash) @bar = hash end end 

why is this syntax error

 foo = Foo.new do bar {:param1=>'value1', :param2=>"value2"} end 

The syntax error that gives me this is SyntaxError: unexpected ',', expecting '}' bar {:param1=>'value1',:param2=>'value2'} What is the correct way to use the hash inside instance_eval, as in the example above. I really need to pass the hash to the method inside instance_eval