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[SR-5108] Collection Type Shorthand Syntax Issues #47684

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an0 mannequin opened this issue Jun 6, 2017 · 3 comments
Open

[SR-5108] Collection Type Shorthand Syntax Issues #47684

an0 mannequin opened this issue Jun 6, 2017 · 3 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself parser Area → compiler: The legacy C++ parser

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@an0
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Mannequin

an0 mannequin commented Jun 6, 2017

Previous ID SR-5108
Radar None
Original Reporter @an0
Type Bug
Environment

Xcode 9M136h

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, Parser
Assignee None
Priority Medium

md5: 1e8165b3e3374e192cd7fdf2f4dafd11

is duplicated by:

  • SR-11130 Type sugar supports nested types inconsistently

Issue Description:

struct Foo<T>: Sequence {
    
    var contents: [T]
    
    // [T].Iterator should be the same as Array<T>.Iterator but is not supported.
    func makeIterator() -> [T].Iterator {
        return contents.makeIterator()
    }
    
}
@theblixguy
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Does this need to go through evolution or is this a bug/improvement? @rintaro

@swift-ci
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swift-ci commented Oct 9, 2019

Comment by Owen Voorhees (JIRA)

The core team has previously indicated this would be a bug fix based on the dupe I just linked

@swift-ci
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Comment by Anass ALZurba (JIRA)

Any updates regarding this bug?
My understanding is that it's a limitation at the grammar level

We have the following rules:

type → dictionary-type

type → type-identifier

The second rule allows usage of nested types, while the first allows syntactic sugar for dictionaries

Would it be possible to add more rules to fix this bug?
I'm thinking something like

type → dictionary-type.type-identifier

@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 parser Area → compiler: The legacy C++ parser
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@theblixguy @swift-ci