method_exception_syntax.rb

# Valid syntax
def do_stuff(arg1)
  do_something(arg1)
rescue AnError => e
  process_error(e)
end

# Syntax Error
do_stuff = lambda do |arg1|
  do_something(arg1)
rescue AnError => e
  process_error(e)
end

# So you can't do something like:
method_that_accepts_blocks(argument) do |yield_argument|
  perform_some_stuff
  do_something_else(yield_argument)
rescue SomeError => e
  handle_error(e)
end