It's not hard if we disallow statements, and make everything into an expression that returns a value -- something that Ruby does right. The value of a block of statements is just the value of the last statement in the block.
So, whether you call it a function, or a method, or a lambda, or a block, whitespace with multi-line expressions can be made to work.
The commonly-cited lambda-with-multiple-prints example, in CoffeeScript: