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[SR-7224] String.init(_ substring: Substring) is failable on Linux. #49772

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louisdh opened this issue Mar 18, 2018 · 2 comments
Open

[SR-7224] String.init(_ substring: Substring) is failable on Linux. #49772

louisdh opened this issue Mar 18, 2018 · 2 comments
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@milseman
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@louisdh
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louisdh commented Mar 18, 2018

Previous ID SR-7224
Radar None
Original Reporter @louisdh
Type Bug
Environment

Apple Swift version 4.0.3 (swiftlang-900.0.74.1 clang-900.0.39.2)

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

md5: 4de3fa3865c018bf532130f3b1ff7164

Issue Description:

Initializing a String from a Substring is non-failable on iOS, macOS, ...
On Linux, however, this is failable.

For example, the following code compiles when targeting macOS, but gives a compile error on Linux:

let foo = "Hello world"

let bar = String(foo[foo.startIndex..<foo.endIndex])

// Error on Linux: "value of optional type 'String?' not unwrapped; did you mean to use '!' or '?'?"
if bar.hasPrefix("") {
    // do something
}
@belkadan
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@milseman, any idea what's going on here?

@milseman
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Mannequin

milseman mannequin commented Mar 19, 2018

No idea why. CC Lance (JIRA User) who has been looking at some of the String.init mismatch here

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

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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@belkadan @louisdh