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[SR-11702] Misleading Error Message "Subscript 'subscript(_: )' requires the types 'String.Index' and 'Int' be equivalent" #54110

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swift-ci opened this issue Nov 2, 2019 · 3 comments
Closed

[SR-11702] Misleading Error Message "Subscript 'subscript(_: )' requires the types 'String.Index' and 'Int' be equivalent" #54110

swift-ci opened this issue Nov 2, 2019 · 3 comments
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compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation improvement

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@swift-ci
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swift-ci commented Nov 2, 2019

Previous ID SR-11702
Radar None
Original Reporter cocoanetics (JIRA User)
Type Improvement
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, DiagnosticsQoI
Assignee None
Priority Medium

md5: 265d39699983fb138f48fa2a0e4a8417

relates to:

  • SR-12703 Another Occurrence of the Misleading Error Message "subscript 'subscript(_:)' requires the types 'String.Index' and 'Int' be equivalent"

Issue Description:

Paste the following into a playground:

import Foundation
{{ }}
var string = "something;"{{ }}
if let index = string.firstIndex(of: ";")
{{ string = string[..<index]}}{{ }}
{{}}}

You get a misleading error message:

Subscript 'subscript(_: )' requires the types 'String.Index' and 'Int' be equivalent

Really the reason for the error is that you cannot assign a Substring to a String and the error message should say that.
@theblixguy
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This diagnostic has been improved on master:

/Users/suyashsrijan/Desktop/test.swift:5:18: error: cannot assign value of type 'String.SubSequence' (aka 'Substring') to type 'String'
  string = string[..<index]
           ~~~~~~^~~~~~~~~~
           String(         )

@theblixguy
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You can verify using the latest development snapshot 🙂 (please don't forget to close the ticket after that)

@marcomasser
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I verified that this is fixed using Swift 5.2.2. But there’s still another case where this error message shows: SR-12703.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation improvement
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@marcomasser @theblixguy @swift-ci