unusedArguments does not work with switch-case-let

[reika727]

I have a code like this:

enum TheEnum {
    case foo(Int)
}

func f(e: TheEnum, bar: String) {
    switch e {
    case let .foo(bar):
        print(bar)
    }
}

This code does not change after being formatted. However, the argument bar is not used inside the function f, so it should be func f(e: TheEnum, bar _: String) (since the unusedArguments option is enabled by default.) It seems that functions with switch-case-let are not formatted properly.

Just for your information, SwiftFormat works fine with functions with if-case-let or guard-case-let.

// BEFORE FORMATTED
enum TheEnum {
    case foo(Int)
}

func f(e: TheEnum, bar: String) {
    if case let .foo(bar) = e {
        print(bar)
    }
}

func g(e: TheEnum, bar: String) {
    guard case let .foo(bar) = e else { return }
    print(bar)
}

// AFTER FORMATTED
enum TheEnum {
    case foo(Int)
}

func f(e: TheEnum, bar _: String) {
    if case let .foo(bar) = e {
        print(bar)
    }
}

func g(e: TheEnum, bar _: String) {
    guard case let .foo(bar) = e else { return }
    print(bar)
}

Environment

$ swiftformat --version
0.54.5