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[SR-8307] Compatibility fails when assigning to string view #50835

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masters3d opened this issue Jul 18, 2018 · 2 comments
Open

[SR-8307] Compatibility fails when assigning to string view #50835

masters3d opened this issue Jul 18, 2018 · 2 comments
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@airspeedswift
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. source compatibility standard library Area: Standard library umbrella

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@masters3d
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Previous ID SR-8307
Radar None
Original Reporter @masters3d
Type Bug
Environment

4.2

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug, SourceCompatibility
Assignee @airspeedswift
Priority Medium

md5: 38ab09fb3f16597678c08498a3f87a93

Issue Description:

Worked in 4.0 and 4.1

```

var mycharacters = "abc".characters

mycharacters = mycharacters .dropFirst() // Fails now in 4.2 compiler in compatibility mode 4.1, 4.0print(Array(mycharacters )) // It print ["b", "c"]

```

apple/swift-source-compat-suite#192 (comment)
@belkadan
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cc @milseman, @airspeedswift

@airspeedswift
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It's because of the change to switch `CharacterView` to be an alias for `String`. I think I can switch it to be an alias for `Substring` instead to resolve this, should be similarly compatible.

Note:

  • this isn't 4.2, it's master (but does break the 4.0/4.2 modes)

  • `.characters` will be gone in 5.0 eventually (but still needs to work in those modes)

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@airspeedswift airspeedswift

Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. source compatibility standard library Area: Standard library umbrella
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@belkadan @masters3d @airspeedswift