#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[non_exhaustive]
pub enum Feature {
ShortOpenTag,
NullCoalesceAssign,
ParameterContravariance,
ReturnCovariance,
PregUnmatchedAsNull,
NonCapturingCatches,
NativeUnionTypes,
RequiredParameterAfterOptional,
LessOverriddenParametersWithVariadic,
ThrowExpression,
ClassConstantOnExpression,
PromotedProperties,
NamedArguments,
ThrowsTypeErrorForInternalFunctions,
ThrowsValueErrorForInternalFunctions,
HHPrintfSpecifier,
StricterRoundFunctions,
ThrowsOnInvalidMbStringEncoding,
WarnsAboutFinalPrivateMethods,
CallableInstanceMethods,
LegacyConstructor,
UnsetCast,
CaseInsensitiveConstantNames,
InterfaceConstantImplicitlyFinal,
ArrayFunctionsReturnNullWithNonArray,
SubstrReturnFalseInsteadOfEmptyString,
CurlUrlOptionCheckingFileSchemeWithOpenBasedir,
EmptyStringValidAliasForNoneInMbSubstituteCharacter,
NumericStringValidArgInMbSubstituteCharacter,
ParameterTypeWidening,
AllUnicodeScalarCodePointsInMbSubstituteCharacter,
PassNoneEncodings,
RequiredParameterAfterOptionalNullableAndDefaultNull,
FinalConstants,
ReadonlyProperties,
Enums,
PureIntersectionTypes,
TentativeReturnTypes,
ClosureCreation,
ArrayUnpackingWithStringKeys,
SerializableRequiresMagicMethods,
DynamicProperties,
StrSplitReturnsEmptyArray,
DisjunctiveNormalForm,
ReadonlyClasses,
NeverReturnTypeInArrowFunction,
PregCaptureOnlyNamedGroups,
ConstantsInTraits,
AsymmetricVisibility,
LazyObjects,
RequiredParameterAfterOptionalUnionOrMixed,
DateTimeExceptions,
TypedClassLikeConstants,
TypedProperties,
OverrideAttribute,
DynamicClassConstantAccess,
ReadonlyAnonymousClasses,
ReadonlyPropertyReinitializationInClone,
CastsNumbersToStringsOnLooseComparison,
NonNumericStringAndIntegerIsFalseOnLooseComparison,
AbstractTraitMethods,
ImplicitlyNullableParameterTypes,
HighlightStringDoesNotReturnFalse,
PropertyHooks,
JsonValidate,
ClosureInConstantExpressions,
ArrowFunctions,
TrueTypeHint,
FalseTypeHint,
FalseCompoundTypeHint,
NullTypeHint,
NullCompoundTypeHint,
NullableTypeHint,
IterableTypeHint,
VoidTypeHint,
MixedTypeHint,
NeverTypeHint,
StaticReturnTypeHint,
NewWithoutParentheses,
ClassLikeConstantVisibilityModifiers,
ListReferenceAssignment,
NumericLiteralSeparator,
AccessClassOnObject,
Attributes,
MatchExpression,
NullSafeOperator,
TrailingCommaInListSyntax,
TrailingCommaInFunctionCalls,
TrailingCommaInClosureUseList,
NewInInitializers,
ConstantAttributes,
CallStaticMethodOnTrait,
CatchOptionalVariable,
CatchUnionType,
VoidCast,
NoDiscardAttribute,
AsymmetricVisibilityForStaticProperties,
ClosureCreationInConstantExpressions,
DeprecatedAttribute,
PipeOperator,
CloneWith,
PartialFunctionApplication,
SwitchSemicolonSeparators,
}