[SR-7093] Index does not include reference to constructor of class/struct with generic types

[swift-ci]

Previous ID	SR-7093
Radar	rdar://problem/70955529
Original Reporter	Leitch (JIRA User)
Type	Bug

Environment

Using SourceKitten to perform the SourceKit request.

Xcode 9.2
Build version 9C40b

macOS 10.13.3

Additional Detail from JIRA

Votes	2
Component/s	Source Tooling
Labels	Bug
Assignee	None
Priority	Medium

md5: f31c557a78a7016c21e6bf633e9bada7

Issue Description:

Given the following code:

class ClassA<T> {
    init(someVar: Int = 0) {}
}

class ClassB {
    private let classA: ClassA<String>

    init() {
        classA = ClassA<String>()
    }
}

A source.request.indexsource response does not include a source.lang.swift.ref.function.constructor reference for ClassA<String>() to the declaration init(someVar:). The constructor has the USR s:4test6ClassACACyxGSi7someVar_tcfc and it is not referenced anywhere in the index.

This issue appears to only affect classes with generic types. If I remove the generic type from ClassA, the ClassB constructor declaration will contain a reference to init(someVar:).

Full index response is here: https://gist.github.com/ileitch/2b6b08ab247d712da752c5c24b5fca85

/cc @nkcsgexi @benlangmuir

[swift-ci]

Comment by Ian Leitch (JIRA)

@benlangmuir This is also an issue with the index store in Swift 5.3.1.

[benlangmuir]

Also reproduces with indexing while building

$ swift-ide-test --print-indexed-symbols --source-filename /tmp/t.swift
...
9:18 | class/Swift | ClassA | s:14swift_ide_test6ClassAC | Ref,RelCont | rel: 1
  RelCont | constructor/Swift | init() | s:14swift_ide_test6ClassBCACycfc
9:25 | struct/Swift | String | s:SS | Ref,RelCont | rel: 1
  RelCont | constructor/Swift | init() | s:14swift_ide_test6ClassBCACycfc

No reference to the initializer.

[benlangmuir]

@swift-ci create

[swift-ci]

Comment by Ian Leitch (JIRA)

This also affects generic structs.

[keith]

dup of #54532, fixed on main, hopefully will make 5.9