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[SR-2199] Ambiguous use of operator '+' #44806

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krzyzanowskim opened this issue Jul 28, 2016 · 2 comments
Open

[SR-2199] Ambiguous use of operator '+' #44806

krzyzanowskim opened this issue Jul 28, 2016 · 2 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation

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@krzyzanowskim
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Previous ID SR-2199
Radar None
Original Reporter @krzyzanowskim
Type Bug
Environment

DEVELOPMENT-SNAPSHOT-2016-07-25-a

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

md5: 1fa6ee47be765a99180d02a5cfbaf8dc

relates to:

  • SR-1255 Binary operator '||' cannot be applied to two 'Bool' operands.

Issue Description:

There is ambiguity of '+' operator as shown below. I'm not sure what cause it (Xcode not helping) though it may be due to Aritmetic (or SignedNumber).

let a: UInt = 1
let b: Int = 1
let c = a + b // Error: Ambiguous use of operator '+'

let aa: UInt32 = 1
let bb: UInt = 1
let cc = aa + bb // Error: Binary operator '+' cannot be applied to operands of type 'UInt32' and 'UInt'
@belkadan
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This has never been allowed*, but we could probably produce better diagnostics.

* We had an unfortunate case in the past where the integer types being ForwardIndexes with a Distance type of 'Int' caused + to be accepted on mixed types. We attempted to defend against that by making it ambiguous, but the Swift 3 collection model fixes it altogether by moving the "advance" method to the collection.

@Dante-Broggi
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I think this should be resolved as expected behavior.

@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 diagnostics QoI Bug: Diagnostics Quality of Implementation
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@belkadan @krzyzanowskim @Dante-Broggi