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de323b5bef
If the -enable-experimental-subclass-existentials staging flag is on, resolveType() now allows protocol compositions to contain class types. It also diagnoses if a composition has more than one superclass requirement. Also, change diagnostics that talked about 'protocol composition' to 'protocol-constrained type'. Since such types can now contain a superclass constraint, it's not correct to call them protocol composition. "Protocol-constrained type" isn't quite accurate either because 'Any' has no protocols, and 'AnyObject' will have no protocols but a general class constraint; but those are edge cases which won't come up in these diagnostics.
54 lines
2.5 KiB
Swift
54 lines
2.5 KiB
Swift
// RUN: %target-typecheck-verify-swift
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class A { }
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protocol P { }
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// Duplicate inheritance
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class B : A, A { } // expected-error{{duplicate inheritance from 'A'}}{{12-15=}}
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// Duplicate inheritance from protocol
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class B2 : P, P { } // expected-error{{duplicate inheritance from 'P'}}{{13-16=}}
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// Multiple inheritance
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class C : B, A { } // expected-error{{multiple inheritance from classes 'B' and 'A'}}
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// Superclass in the wrong position
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class D : P, A { } // expected-error{{superclass 'A' must appear first in the inheritance clause}}{{12-15=}}{{11-11=A, }}
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// Struct inheriting a class
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struct S : A { } // expected-error{{non-class type 'S' cannot inherit from class 'A'}}
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// Protocol inheriting a class
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protocol Q : A { } // expected-error{{non-class type 'Q' cannot inherit from class 'A'}}
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// Extension inheriting a class
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extension C : A { } // expected-error{{extension of type 'C' cannot inherit from class 'A'}}
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// Keywords in inheritance clauses
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struct S2 : struct { } // expected-error{{expected identifier for type name}}
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// Protocol composition in inheritance clauses
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struct S3 : P, P & Q { } // expected-error {{duplicate inheritance from 'P'}}
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// expected-error @-1 {{protocol-constrained type is neither allowed nor needed here}}
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// expected-error @-2 {{'Q' requires that 'S3' inherit from 'A'}}
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// expected-note @-3 {{requirement specified as 'Self' : 'A' [with Self = S3]}}
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struct S4 : P, P { } // expected-error {{duplicate inheritance from 'P'}}
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struct S6 : P & { } // expected-error {{expected identifier for type name}}
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// expected-error @-1 {{protocol-constrained type is neither allowed nor needed here}}
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struct S7 : protocol<P, Q> { } // expected-warning {{'protocol<...>' composition syntax is deprecated; join the protocols using '&'}}
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// expected-error @-1 {{protocol-constrained type is neither allowed nor needed here}}{{13-22=}} {{26-27=}}
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// expected-error @-2 {{'Q' requires that 'S7' inherit from 'A'}}
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// expected-note @-3 {{requirement specified as 'Self' : 'A' [with Self = S7]}}
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class GenericBase<T> {}
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class GenericSub<T> : GenericBase<T> {} // okay
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class InheritGenericParam<T> : T {} // expected-error {{inheritance from non-protocol, non-class type 'T'}}
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class InheritBody : T { // expected-error {{use of undeclared type 'T'}}
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typealias T = A
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}
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class InheritBodyBad : fn { // expected-error {{use of undeclared type 'fn'}}
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func fn() {}
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}
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