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[SR-6945] Error in struct init, saying 'self' used before assignment for the assignment itself #49493

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milseman mannequin opened this issue Feb 7, 2018 · 3 comments
Open

[SR-6945] Error in struct init, saying 'self' used before assignment for the assignment itself #49493

milseman mannequin opened this issue Feb 7, 2018 · 3 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@milseman
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Mannequin

milseman mannequin commented Feb 7, 2018

Previous ID SR-6945
Radar None
Original Reporter @milseman
Type Bug
Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: b3efc2af15234adf6e9b4959548a8d2d

is duplicated by:

  • SR-15670 'let' property reinitialization checking is flow-insensitive

Issue Description:

When initializing a struct, having a conditional call to another init followed by an early return produces a compilation error about whether the struct was properly initialized.

Reproducer:
https://gist.github.com/milseman/d8360121856f4780bd5172cc94f96251

struct S1 {
  var stored: UInt?

  init(_ x: UInt) {
    if x > 42 {
      self.init(_big: x)
      return
    }
    self.stored = x // <--- error: 'self' used before 'self.init' call or assignment to 'self'
  }

  init(_big x: UInt) {
    self.stored = x
  }
}

struct S2 {
  var stored: UInt?

  init(_ x: UInt) {
    if x > 42 {
      self.init(_big: x)
      return
    }
    self.init(_small: x)
  }

  init(_big x: UInt) {
    self.stored = x
  }

  init(_small x: UInt) {
    self.stored = x
  }
}

S1 has the error, S2 does not.
@gottesmm
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gottesmm commented Feb 7, 2018

@swift-ci sync

@belkadan
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belkadan commented Feb 8, 2018

Workaround: use self = S1(_big: x) instead.

We try to decide up front if a struct initializer is going to be per-field or delegating, but I guess I screwed that check up.

@belkadan
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belkadan commented Feb 8, 2018

Not a regression, at least.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@gottesmm @belkadan