[SR-14172] Quick help shows incorrect type for variadic arguments

[xAlien95]

Previous ID	SR-14172
Radar	rdar://problem/74149101
Original Reporter	@xAlien95
Type	Bug

Attachment: Download

Environment

Xcode 12.4 (12D4e)
Swift Development Snapshot 2021-02-02

Additional Detail from JIRA

Votes	0
Component/s	SourceKit-LSP
Labels	Bug
Assignee	None
Priority	Medium

md5: d072d009b866e9dacf0aacc5c068c3cb

Issue Description:

Consider the following snippet:

func foo(x: Int...) {
  // overviewed as "let x: Int" (see attachment)
  // suggested as "x: [Int]"
  x
}

The underlying type is correct. The bug is only due to the Language Server Protocol (also tested in Visual Studio Code and the behavior is the same).

[typesanitizer]

@swift-ci create