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

[JetForMe]

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.

[ashuthe1]

hey! I want to work on this but I am new to open source. could you please guide me.

[Rajveer100]

Hi there, Rajveer here, I found this error in DiagnosticsSema.def:

ERROR(instance_member_use_on_type,none,
      "instance member %1 cannot be used on type %0; "
      "did you mean to use a value of this type instead?", (Type, DeclNameRef))

[AnthonyLatsis]

This issue was recently worked on by @valeriyvan. Check out the pull request for commentary and consider checking in with Valeriy if you wish to work on this.

[dk-talks]

Hello @AnthonyLatsis , I have resolved this issue. Please have a look. #65539

[Niyatijain-9]

Hey, could you please assign me this?

[Niyatijain-9]

PR #78043 raised, Kindly review. Please let me know if it requires any further changes.