Destructuring about abra-lang HOT 1 CLOSED

#245 addresses nearly every case here. The only situation not covered is destructuring function parameters. Adding destructuring to function parameters makes it complicated to call functions with named arguments (what name do we provide to a destructured value?).

One possible solution, for the sake of ergonomics, would be to enable function parameter destructuring in lambdas only, and add strict checks that lambdas are never invoked using named arguments? That shouldn't be too game-changing, since it's probably a good thing to have anyway - lambdas rarely are even defined with named arguments. We should also throw an error when attempting to use destructuring in func declarations, something like "cannot use destructuring in a function declaration, can only be used in lambdas". See #251 for more details

from abra-lang.