[SR-13033] Seg fault with property wrapper and underscored variables

[mbrandonw]

Previous ID	SR-13033
Radar	None
Original Reporter	@mbrandonw
Type	Bug
Status	Closed
Resolution	Duplicate

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, CompilerCrash, TypeChecker
Assignee	None
Priority	Medium

md5: 9119ca03622a9241ce095ecc48332526

duplicates:

• SR-12839 Underscore variable with same name as published var crashes compiler

Issue Description:

class Foo: ObservableObject {
  @Published var foo = 0
  var _foo = 0
}

[theblixguy]

This was fixed by #31915 on master and 5.3. You can verify using a development snapshot from swift.org:

/Users/spare/Desktop/test.swift:5:7: error: invalid redeclaration of synthesized property '_foo'
  var _foo = 0
      ^
/Users/spare/Desktop/test.swift:4:18: note: '_foo' synthesized for property wrapper backing storage
  @Published var foo = 0
                 ^