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Merge pull request swiftlang#76740 from drodriguez/test-swift-features
[test] Improve testing of Swift features
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‎docs/Testing.md‎

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* ``XFAIL: linux``: tests that need to be adapted for Linux, for example parts
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that depend on Objective-C interop need to be split out.
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#### Features ``REQUIRES: swift_feature_...``
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Each of the Swift compiler features defined in `include/swift/Basic/Features.def`
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will get a LLVM Lit feature prefixing `swift_feature_` to the feature name
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automatically. The LLVM Lit features will be available only in those
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configurations where the compiler supports the given feature, and will not be
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available when the compiler does not support the feature. This means that
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standard language features and upcoming features will always be available,
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while experimental features will only be available when the compiler supports
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them.
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For every test that uses `--enable-experimental-feature` or
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`--enable-upcoming-feature` add a `REQUIRES: swift_feature_...` for each of the
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used features. The `Misc/verify-swift-feature-testing.test-sh` will check that
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every test with those command line arguments have the necessary `REQUIRES:` and
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fail otherwise.
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Do NOT add `REQUIRES: asserts` for experimental features anymore. The correct
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usage of `REQUIRES: swift_feature_...` will take care of testing the feature as
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it evolves from experimental, to upcoming, to language feature.
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#### Feature ``REQUIRES: executable_test``
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This feature marks an executable test. The test harness makes this feature

‎test/ASTGen/attrs.swift‎

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// REQUIRES: executable_test
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// REQUIRES: swift_swift_parser
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// REQUIRES: swift_feature_ParserASTGen
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// rdar://116686158
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// UNSUPPORTED: asan
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‎test/ASTGen/decls.swift‎

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// REQUIRES: executable_test
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// REQUIRES: swift_swift_parser
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// REQUIRES: swift_feature_ParserASTGen
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// REQUIRES: swift_feature_SwiftParser
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// REQUIRES: swift_feature_ValueGenerics
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// rdar://116686158
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// UNSUPPORTED: asan
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‎test/ASTGen/diagnostics.swift‎

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// RUN: %target-typecheck-verify-swift -disable-availability-checking -enable-bare-slash-regex -enable-experimental-feature ParserASTGen
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// REQUIRES: swift_swift_parser
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// REQUIRES: swift_feature_ParserASTGen
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// rdar://116686158
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// UNSUPPORTED: asan
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‎test/ASTGen/do_expr.swift‎

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// RUN: %target-typecheck-verify-swift -disable-availability-checking -enable-experimental-feature DoExpressions -enable-experimental-feature ParserASTGen
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// REQUIRES: swift_swift_parser
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// REQUIRES: swift_feature_DoExpressions
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// REQUIRES: swift_feature_ParserASTGen
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// rdar://116686158
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// UNSUPPORTED: asan
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‎test/ASTGen/exprs.swift‎

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// REQUIRES: executable_test
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// REQUIRES: swift_swift_parser
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// REQUIRES: swift_feature_ParserASTGen
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// REQUIRES: swift_feature_SwiftParser
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// rdar://116686158
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// UNSUPPORTED: asan
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‎test/ASTGen/if_config.swift‎

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// RUN: %target-typecheck-verify-swift -enable-experimental-feature ParserASTGen -DDISCARDABLE -DNONSENDABLE -swift-version 6
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/// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// REQUIRES: swift_feature_ParserASTGen
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#if NOT_SET
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func f { } // expected-error{{expected parameter clause in function signature}}

‎test/ASTGen/if_config_expr.swift‎

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// RUN: %target-typecheck-verify-swift -enable-experimental-feature ParserASTGen -D CONDITION_1
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// REQUIRES: swift_swift_parser
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// REQUIRES: swift_feature_ParserASTGen
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postfix operator ++
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postfix func ++ (_: Int) -> Int { 0 }

‎test/ASTGen/macros.swift‎

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// REQUIRES: swift_swift_parser, asserts
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// REQUIRES: swift_feature_ParserASTGen
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// RUN: %empty-directory(%t)
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‎test/ASTGen/regex.swift‎

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// RUN: %target-typecheck-verify-swift -enable-experimental-feature ParserASTGen -enable-bare-slash-regex -disable-availability-checking
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// REQUIRES: swift_swift_parser
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// REQUIRES: swift_feature_ParserASTGen
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// -enable-experimental-feature requires an asserts build
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// REQUIRES: asserts
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// rdar://116686158
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// UNSUPPORTED: asan
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