swiftlang/swift

"Instance member cannot be used on type" diagnostic message could be more specific

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#62.909 aperta il 8 gen 2023

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Descrizione

Motivation

It took me far too long to understand why the compiler was giving me this error (I was quickly trying something a bit less trivial than this example involving async/await, and thought the issue was around the execution context):

@main public struct Scraper
{
    public static func main()
    {
        let data = fetch()     //  Instance member 'fetch' cannot be used on type 'Scraper'
                   ^~~~~
    }
    
    func fetch() -> Data
    {
        return Data()
    }
}

Solution

A more precise wording, something like "Instance method cannot be called from static context", would be much more helpful.

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