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335b766b25
Enables SE-0348 `buildPartialBlock` feature by default. The frontend flag is kept for compatibility with existing clients, but is now ineffective. Also includes some improved error messages for invalid result builder call sites.
250 lines
13 KiB
Swift
250 lines
13 KiB
Swift
// RUN: %target-typecheck-verify-swift
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@resultBuilder // expected-error {{'@resultBuilder' attribute cannot be applied to this declaration}}
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var globalBuilder: Int
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@resultBuilder // expected-error {{'@resultBuilder' attribute cannot be applied to this declaration}}
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func globalBuilderFunction() -> Int { return 0 }
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@resultBuilder
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struct Maker {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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@resultBuilder
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class Inventor {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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@Maker // expected-error {{result builder attribute 'Maker' can only be applied to a parameter, function, or computed property}}
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typealias typename = Inventor
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@Maker // expected-error {{result builder attribute 'Maker' can only be applied to a variable if it defines a getter}}
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var global: Int
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// FIXME: should this be allowed?
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@Maker
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var globalWithEmptyImplicitGetter: Int {}
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// expected-error@-1 {{missing return in accessor expected to return 'Int'}}
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// expected-error@-3 {{result builder attribute 'Maker' can only be applied to a variable if it defines a getter}}
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@Maker
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var globalWithEmptyExplicitGetter: Int { get {} } // expected-error{{result builder 'Maker' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@Maker
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var globalWithSingleGetter: Int { 0 } // expected-error {{result builder 'Maker' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@Maker
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var globalWithMultiGetter: Int { 0; 0 } // expected-error {{result builder 'Maker' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@Maker
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func globalFunction() {} // expected-error {{result builder 'Maker' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@Maker
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func globalFunctionWithFunctionParam(fn: () -> ()) {} // expected-error {{result builder 'Maker' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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func makerParam(@Maker
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fn: () -> ()) {}
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// FIXME: these diagnostics are reversed?
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func makerParamRedundant(@Maker // expected-error {{only one result builder attribute can be attached to a parameter}}
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@Maker // expected-note {{previous result builder specified here}}
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fn: () -> ()) {}
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func makerParamConflict(@Maker // expected-error {{only one result builder attribute can be attached to a parameter}}
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@Inventor // expected-note {{previous result builder specified here}}
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fn: () -> ()) {}
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func makerParamMissing1(@Missing // expected-error {{unknown attribute 'Missing'}}
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@Maker
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fn: () -> ()) {}
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func makerParamMissing2(@Maker
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@Missing // expected-error {{unknown attribute 'Missing'}}
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fn: () -> ()) {}
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func makerParamExtra(@Maker(5) // expected-error {{result builder attributes cannot have arguments}}
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fn: () -> ()) {}
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func makerParamAutoclosure(@Maker // expected-error {{result builder attribute 'Maker' cannot be applied to an autoclosure parameter}}
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fn: @autoclosure () -> ()) {}
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@resultBuilder
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struct GenericMaker<T> {} // expected-note {{generic type 'GenericMaker' declared here}} expected-error {{result builder must provide at least one static 'buildBlock' method}}
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struct GenericContainer<T> { // expected-note {{generic type 'GenericContainer' declared here}}
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@resultBuilder
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struct Maker {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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}
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func makeParamUnbound(@GenericMaker // expected-error {{reference to generic type 'GenericMaker' requires arguments}}
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fn: () -> ()) {}
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func makeParamBound(@GenericMaker<Int>
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fn: () -> ()) {}
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func makeParamNestedUnbound(@GenericContainer.Maker // expected-error {{reference to generic type 'GenericContainer' requires arguments}}
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fn: () -> ()) {}
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func makeParamNestedBound(@GenericContainer<Int>.Maker
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fn: () -> ()) {}
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protocol P { }
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@resultBuilder
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struct ConstrainedGenericMaker<T: P> {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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struct WithinGeneric<U> {
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func makeParamBoundInContext(@GenericMaker<U> fn: () -> ()) {}
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// expected-error@+1{{type 'U' does not conform to protocol 'P'}}
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func makeParamBoundInContextBad(@ConstrainedGenericMaker<U>
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fn: () -> ()) {}
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}
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@resultBuilder
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struct ValidBuilder1 {
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static func buildBlock(_ exprs: Any...) -> Int { return exprs.count }
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}
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protocol BuilderFuncHelper {}
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extension BuilderFuncHelper {
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static func buildBlock(_ exprs: Any...) -> Int { return exprs.count }
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}
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@resultBuilder
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struct ValidBuilder2: BuilderFuncHelper {}
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class BuilderFuncBase {
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static func buildBlock(_ exprs: Any...) -> Int { return exprs.count }
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}
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@resultBuilder
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class ValidBuilder3: BuilderFuncBase {}
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@resultBuilder
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struct ValidBuilder4 {}
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extension ValidBuilder4 {
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static func buildBlock(_ exprs: Any...) -> Int { return exprs.count }
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}
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@resultBuilder
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struct ValidBuilder5 {
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static func buildBlock() -> Int { 0 }
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}
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@resultBuilder
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struct InvalidBuilder1 {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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@resultBuilder
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struct InvalidBuilder2 { // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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func buildBlock(_ exprs: Any...) -> Int { return exprs.count } // expected-note {{did you mean to make instance method 'buildBlock' static?}} {{3-3=static }}
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}
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@resultBuilder
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struct InvalidBuilder3 { // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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var buildBlock: (Any...) -> Int = { return $0.count } // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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@resultBuilder
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struct InvalidBuilder4 {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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extension InvalidBuilder4 {
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func buildBlock(_ exprs: Any...) -> Int { return exprs.count } // expected-note {{did you mean to make instance method 'buildBlock' static?}} {{3-3=static }}
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}
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protocol InvalidBuilderHelper {}
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extension InvalidBuilderHelper {
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func buildBlock(_ exprs: Any...) -> Int { return exprs.count } // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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@resultBuilder
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struct InvalidBuilder5: InvalidBuilderHelper {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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@resultBuilder
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struct InvalidBuilder6 { // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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static var buildBlock: Int = 0 // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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struct Callable {
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func callAsFunction(_ exprs: Any...) -> Int { return exprs.count }
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}
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@resultBuilder
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struct InvalidBuilder7 { // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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static var buildBlock = Callable() // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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class BuilderVarBase {
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static var buildBlock: (Any...) -> Int = { return $0.count } // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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@resultBuilder
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class InvalidBuilder8: BuilderVarBase {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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protocol BuilderVarHelper {}
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extension BuilderVarHelper {
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static var buildBlock: (Any...) -> Int { { return $0.count } } // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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@resultBuilder
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struct InvalidBuilder9: BuilderVarHelper {} // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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@resultBuilder
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struct InvalidBuilder10 { // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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static var buildBlock: (Any...) -> Int = { return $0.count } // expected-note {{potential match 'buildBlock' is not a static method}}
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}
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@resultBuilder
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enum InvalidBuilder11 { // expected-error {{result builder must provide at least one static 'buildBlock' method}}
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case buildBlock(Any) // expected-note {{enum case 'buildBlock' cannot be used to satisfy the result builder requirement}}
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}
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@resultBuilder
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struct ValidPairwiseBuilder1 {
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static func buildPartialBlock(first: Int) -> Int { fatalError() }
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static func buildPartialBlock(accumulated: Int, next: Int) -> Int { fatalError() }
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}
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@resultBuilder
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struct UnavailablePairwiseBuilder {
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@available(*, unavailable)
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static func buildPartialBlock(first: Int) -> Int { fatalError() }
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@available(*, unavailable)
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static func buildPartialBlock(accumulated: Int, next: Int) -> Int { fatalError() }
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// available
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// static func buildBlock(_: Int...) -> Int { fatalError() }
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}
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@resultBuilder
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struct InvalidPairwiseBuilder1 {} // expected-error {{result builder must provide at least one static 'buildBlock' method, or both 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)'}}
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@resultBuilder
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struct InvalidPairwiseBuilder2 { // expected-error {{result builder must provide at least one static 'buildBlock' method, or both 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)'}}
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static func buildPartialBlock(first: Any) -> Any { fatalError() }
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}
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@resultBuilder
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struct InvalidPairwiseBuilder3 { // expected-error {{result builder must provide at least one static 'buildBlock' method, or both 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)'}}
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static func buildPartialBlock(accumulated: Any, next: Any) -> Any { fatalError() }
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}
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struct S {
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@ValidBuilder1 var v1: Int { 1 }
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@ValidBuilder2 var v2: Int { 1 }
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@ValidBuilder3 var v3: Int { 1 }
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@ValidBuilder4 var v4: Int { 1 }
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@ValidBuilder5 func v5() -> Int {}
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@InvalidBuilder1 var i1: Int { 1 } // expected-error {{result builder 'InvalidBuilder1' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder2 var i2: Int { 1 } // expected-error {{result builder 'InvalidBuilder2' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder3 var i3: Int { 1 } // expected-error {{result builder 'InvalidBuilder3' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder4 var i4: Int { 1 } // expected-error {{result builder 'InvalidBuilder4' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder5 var i5: Int { 1 } // expected-error {{result builder 'InvalidBuilder5' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder6 var i6: Int { 1 } // expected-error {{result builder 'InvalidBuilder6' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder7 var i7: Int { 1 } // expected-error {{result builder 'InvalidBuilder7' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder8 var i8: Int { 1 } // expected-error {{result builder 'InvalidBuilder8' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder9 var i9: Int { 1 } // expected-error {{result builder 'InvalidBuilder9' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder10 var i10: Int { 1 } // expected-error {{result builder 'InvalidBuilder10' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@InvalidBuilder11 var i11: InvalidBuilder11 { 1 } // expected-error {{result builder 'InvalidBuilder11' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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@ValidPairwiseBuilder1 var i12: Int { 1 }
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@UnavailablePairwiseBuilder var i13: Int { 1; 1; 1 } // expected-error {{result builder 'UnavailablePairwiseBuilder' does not implement any 'buildBlock' or a combination of 'buildPartialBlock(first:)' and 'buildPartialBlock(accumulated:next:)' with sufficient availability for this call site}}
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}
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