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[SR-7066] Compiler does not warn on duplicate keys for dictionary literals #49614

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swift-ci opened this issue Feb 23, 2018 · 3 comments
Open

[SR-7066] Compiler does not warn on duplicate keys for dictionary literals #49614

swift-ci opened this issue Feb 23, 2018 · 3 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself standard library Area: Standard library umbrella

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@swift-ci
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Previous ID SR-7066
Radar None
Original Reporter erica (JIRA User)
Type Bug
Environment

Version 9.2 (9C40b)

Additional Detail from JIRA
Votes 0
Component/s Compiler, Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 55fa9f54aa6d8465d1df9a15dab092cf

Issue Description:

let insets: UIEdgeInsets = [.left: 4, .right: 4, .left: 8]

The compiler accepts this without warning. I think it probably should warn/error if the literal can be checked at compile time.
@swift-ci
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Comment by erica sadun (JIRA)

The problem may be with the name, as a dictionary literal is initialized as an ordered array of tuples (thanks Stephen Celis). Maybe it should be a "tuple sequence literal".

See Also: https://developer.apple.com/documentation/swift/dictionaryliteral

@belkadan
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Yeah, I think this behavior is deliberate, and it'd also be hard to do for non-literal types. (We'd need some kind of notion of structurally-equivalent expressions, which is not unreasonable but isn't something the compiler currently has.). @moiseev, @airspeedswift, thoughts?

@swift-ci
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Comment by erica sadun (JIRA)

There are really two questions here:

  1. Is including the same key in a dictionary literal a bug, and if so, can it be caught?

  2. If the problem is in the name, which promises a dictionary literal (which this isn't due to key duplication), can it be solved by renaming to a more accurate `DictionaryStyleLiteral` or `DictionaryStyleTupleSequence` or `DictionaryStyleLiteralInitializable` sort of thing?

@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 standard library Area: Standard library umbrella
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@belkadan @swift-ci