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Jonathan Grynspan
e526ae36e8
This PR allows the use, in Embedded Swift, of the overloads of `String.init(describing:)` that are constrained to specific protocols (currently `CustomStringConvertible` and `TextOutputStreamable`). These overloads can be fully supported in Embedded Swift as they do not rely on runtime type inspection and just call through to protocol requirements known at compile time. - **Explanation**: Allows some uses of `String.init(describing:)` in Embedded Swift. - **Scope**: Embedded Swift, stringification - **Issues**: rdar://139729101 - **Risk**: Low - **Testing**: Existing CI coverage and new test file.
21 lines
567 B
Swift
21 lines
567 B
Swift
// RUN: %target-swift-emit-ir -verify -verify-ignore-unrelated %s -enable-experimental-feature Embedded -wmo
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// REQUIRES: swift_in_compiler
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// REQUIRES: optimized_stdlib
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// REQUIRES: swift_feature_Embedded
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public struct MyStruct: CustomStringConvertible {
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public var description: String { "" }
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}
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public struct MyStreamableStruct: TextOutputStreamable {
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public func write<Target: TextOutputStream>(to target: inout Target) {}
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}
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public func foo(s: MyStruct) {
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_ = String(describing: s)
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}
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public func bar(s: MyStreamableStruct) {
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_ = String(describing: s)
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} |