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[SR-5130] Single-tuple and multiple-argument function types should be treated as different types #47706

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jepers opened this issue Jun 6, 2017 · 1 comment
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[SR-5130] Single-tuple and multiple-argument function types should be treated as different types #47706

jepers opened this issue Jun 6, 2017 · 1 comment
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@rudkx
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself type checker Area → compiler: Semantic analysis

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@jepers
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jepers commented Jun 6, 2017

Previous ID SR-5130
Radar rdar://problem/32601620
Original Reporter @jepers
Type Bug
Status Closed
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, TypeChecker
Assignee @rudkx
Priority Medium

md5: 1aa010cf2030ddedb6627eee90ec80cf

Issue Description:

Swift should properly distinguish between single-tuple and multiple-argument function types.
But it isn't, as demonstrated below.
The following is the behavior of swift-DEVELOPMENT-SNAPSHOT-2017-06-05-a-osx (-swift-version 4):

func add(_ a: Int, _ b: Int) -> Int { return a + b }
let a: (Int, Int) -> Int = add
let b: ((Int, Int)) -> Int = add // OK, but why isn't it an error?
print(a(1, 2)) // 3
print(b((1, 2))) // 3
// I would not expect the assignment to b to compile since the func `add`
// does not have the type ((Int, Int)) -> Int.

(Reported as requested by Mark Lacey here:
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170605/037013.html
)
@rudkx
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rudkx commented Jun 7, 2017

@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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@rudkx rudkx

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself type checker Area → compiler: Semantic analysis
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@rudkx @jepers