SE-0257: Eliding commas from multiline expression lists

Evolution Proposal Reviews
51

The problem of ambiguity will be solved if a formatter (SE-0250: Swift Code Style Guidelines and Formatter) is adopted and Xcode also cooperates with it. Expressions connected to the previous line are easy to understand if nested one level.

For example, if formatted as below, it is easy to understand.

_ = [
    "foo": foo
        .method()
    "bar": baz
]

let solutions = [
    2*(1-sqrt(a))*sqrt(b+sqrt(b))
    -(1+sqrt(a))*(sqrt(2*b)-sqrt(2))
] // two solutions
    
let solutions = [
    2*(1-sqrt(a))*sqrt(b+sqrt(b))
        - (1+sqrt(a))*(sqrt(2*b)-sqrt(2))
] // one solution

var x : Any = [
    foo
    (6 * 9) // Function application or separate value?
]

let foo: (Int) -> Int = { $0 * 2 }

let x = foo
(6 * 9) // Function application or separate value?