swiftlang/swift

[SR-4102] 'self' used before all stored properties are initialized when trying to pass in the type to method

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#46,685 opened on Feb 28, 2017

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bugcompilerdiagnostics qualitygood first issue

Description
Previous ID SR-4102
Radar None
Original Reporter nelsonaa (JIRA User)
Type Bug
Status Reopened
Resolution

Xcode Version 8.2.1 (8C1002)
OSX 10.12.3 (16D32)
Swift 3
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, StarterBug
Assignee None
Priority Medium

md5: 492b655bbeac25797294a982ff63d7bf

Issue Description:

Get the error

'self' used before all stored properties are initialized

when trying to pass in the type into a method.

Contributor guide

Tech stack
swift
Domain
tooling
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Swift programming languageunderstanding of initializer rules
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the Swift compiler code in lib/Sema related to initialization error checking. The issue is that passing a type to a method during initialization incorrectly triggers 'self used before all stored properties are initialized'. Look for the diagnostic logic and consider how type parameters should be excluded from the 'self' use check.