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Parsing for `-enable-upcoming-feature` and `-enable-experimental-feature` is lenient by default because some projects need to be compatible with multiple language versions and compiler toolchains simultaneously, and strict diagnostics would be a nuisance. On the other hand, though, it would be useful to get feedback from the compiler when you attempt to enable a feature that doesn't exist. This change splits the difference by introducing new diagnostics for potential feature enablement misconfigurations but leaves those diagnostics ignored by default. Projects that wish to use them can specify `-Wwarning StrictLanguageFeatures`.
48 lines
3.0 KiB
Swift
48 lines
3.0 KiB
Swift
// Make sure that hasFeature(ConciseMagicFile) evaluates true when provided
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// explicitly.
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// RUN: %target-typecheck-verify-swift -enable-upcoming-feature ConciseMagicFile
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// Make sure that hasFeature(ConciseMagicFile) evaluates true in Swift 6.
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// RUN: %target-typecheck-verify-swift -swift-version 6
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// Make sure that hasFeature(ConciseMagicFile) is off prior to Swift 6.
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// RUN: %target-typecheck-verify-swift -verify-additional-prefix swift5-
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// It's fine to provide a feature that we don't know about.
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// RUN: %target-typecheck-verify-swift -enable-upcoming-feature ConciseMagicFile -enable-upcoming-feature UnknownFeature
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// RUN: %target-typecheck-verify-swift -enable-upcoming-feature UnknownFeature -enable-upcoming-feature ConciseMagicFile
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// When -disable-upcoming-feature is specified, leave the feature disabled.
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// RUN: %target-typecheck-verify-swift -disable-upcoming-feature ConciseMagicFile -verify-additional-prefix swift5-
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// When both -enable-upcoming-feature and -disable-upcoming-feature are
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// specified, the result depends on the order.
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// RUN: %target-typecheck-verify-swift -enable-upcoming-feature ConciseMagicFile -disable-upcoming-feature ConciseMagicFile -verify-additional-prefix swift5-
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// RUN: %target-typecheck-verify-swift -disable-upcoming-feature ConciseMagicFile -enable-upcoming-feature ConciseMagicFile
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// For compatibility when a feature graduates, it's fine to refer to an
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// upcoming feature as an experimental feature.
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// RUN: %target-typecheck-verify-swift -enable-experimental-feature ConciseMagicFile
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// A feature that has graduated can also be disabled as an experimental feature.
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// RUN: %target-typecheck-verify-swift -disable-experimental-feature ConciseMagicFile -verify-additional-prefix swift5-
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// RUN: %target-typecheck-verify-swift -enable-experimental-feature ConciseMagicFile -disable-experimental-feature ConciseMagicFile -verify-additional-prefix swift5-
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// RUN: %target-typecheck-verify-swift -disable-experimental-feature ConciseMagicFile -enable-experimental-feature ConciseMagicFile
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// RUN: %target-typecheck-verify-swift -enable-upcoming-feature ConciseMagicFile -disable-experimental-feature ConciseMagicFile -verify-additional-prefix swift5-
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// Warn about enabled features that are implied by the specified language version.
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// RUN: %target-swift-frontend -typecheck -enable-upcoming-feature ConciseMagicFile -swift-version 6 %s 2>&1 | %FileCheck %s
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// RUN: %target-swift-frontend -typecheck -disable-upcoming-feature ConciseMagicFile -swift-version 6 %s 2>&1 | %FileCheck %s
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// RUN: %target-swift-frontend -typecheck -enable-experimental-feature ConciseMagicFile -swift-version 6 %s 2>&1 | %FileCheck %s
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// RUN: %target-swift-frontend -typecheck -disable-experimental-feature ConciseMagicFile -swift-version 6 %s 2>&1 | %FileCheck %s
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// REQUIRES: swift_feature_ConciseMagicFile
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// CHECK: warning: upcoming feature 'ConciseMagicFile' is already enabled as of Swift version 6
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#if hasFeature(ConciseMagicFile)
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let x = 0
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#else
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let y = boom // expected-swift5-error{{'boom'}}
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#endif
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