swift-mirror/test/Parse/features.swift at c52affbd68788b51a613ebd37a33dbdd1cc944cd - swift-mirror - Gitea: Git with a cup of tea

averello/swift-mirror

mirror of https://github.com/apple/swift.git synced 2025-12-21 12:14:44 +01:00

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Doug Gregor fd16deecba Introduce checking for language features via "#if $FeatureName"

Introduce some basic support for defining specific language features
that can be checked by name, e.g.,

    #if $AsyncAwait
    // use the feature
    #endif

For backward compatibility with older compilers, to actually prevent
the parser from parsing, one will have to do a Swift compiler version
check, even though the version number doesn't matter. For example:

    #if compiler(>=5.3) && $AsyncAwait
    // use the feature
    #endif

2021-02-05 15:22:02 -08:00

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Swift

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 // RUN: not %target-swift-frontend -typecheck %s 2>&1 | %FileCheck --check-prefix=CHECK-WITHOUT %s
 // RUN: %target-typecheck-verify-swift -enable-experimental-static-assert
 #if compiler(>=5.3) && $StaticAssert
 #assert(true)
 #else
 // CHECK-WITHOUT: cannot find 'complete' in scope
 complete junk
 #endif