[SR-13792] Index store should relate appendInterpolation from string literals

[swift-ci]

Previous ID	SR-13792
Radar	rdar://problem/70820224
Original Reporter	Leitch (JIRA User)
Type	New Feature

Additional Detail from JIRA

Votes	0
Component/s	Source Tooling
Labels	New Feature
Assignee	Leitch (JIRA)
Priority	Medium

md5: 0896b2e76fc58c37c42a995dde600eea

Issue Description:

Given the following code:

extension String.StringInterpolation {
    mutating func appendInterpolation(test value: Int) {
        appendInterpolation(value)
    }
}

public struct Fixture112 {
    public func someFunc() {
        print("test: \(test: 1)")
    }
}

The index store could include a relation from the someFunc() occurrence to appendInterpolation(test:). For the purposes of identifying unused code, it's not currently possible to identify that appendInterpolation(test:) is used in the string interpolation.

[swift-ci]

Comment by Ian Leitch (JIRA)

/cc @benlangmuir

[benlangmuir]

@swift-ci create

[keith]

seems to still be the case at ed3555a

[Lancelotbronner]

Bringing this back up.