association syntax: key -> value

[nikodemus]

key -> value --> Association from: key to: value

Implement as operator or syntax?

Pro syntax:

• Cannot be overridden
• { a -> x } is a dictionary
• -> is already syntax in method signatures
• Support for destructuring possible: dict do: { |a -> b| ... }

Pro operator:

• less syntax, less special casing
• {} syntax is already wrought

Current thinking: syntax. Mainly because -> is already syntax instead of an operator.

But why is association syntax needed in the first place? ...that's a really good question. Maybe it's not needed right now after all.