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Don't allow overloading by opaque types with different constraints.

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The mangling unfortunately doesn't take the constraints into account, leading to
SR-10725 | rdar://problem/50987172. Changing the mangling at this point is hazardous, so it's probably best
to disallow this for now.
This commit is contained in:
Joe Groff
2019-07-11 15:12:43 -07:00
parent ba7393682d
commit a92fd9defb
2 changed files with 8 additions and 7 deletions
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2
lib/AST/Decl.cpp
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@@ -2369,7 +2369,7 @@ static Type mapSignatureFunctionType(ASTContext &ctx, Type type,
// Functions and subscripts cannot overload differing only in opaque return
// types. Replace the opaque type with `Any`.
if (auto opaque = type->getAs<OpaqueTypeArchetypeType>()) {
type = opaque->getExistentialType();
type = ProtocolCompositionType::get(ctx, {}, /*hasAnyObject*/ false);
}
return mapSignatureParamType(ctx, type);

13
test/type/opaque.swift
View File

@@ -272,10 +272,11 @@ func associatedTypeIdentity() {
sameType(gary(doug()).r_out(), gary(candace()).r_out()) // expected-error{{}}
}
func redeclaration() -> some P { return 0 } // expected-note{{previously declared}}
func redeclaration() -> some P { return 0 } // expected-note 2{{previously declared}}
func redeclaration() -> some P { return 0 } // expected-error{{redeclaration}}
func redeclaration() -> some Q { return 0 }
func redeclaration() -> some Q { return 0 } // expected-error{{redeclaration}}
func redeclaration() -> P { return 0 }
func redeclaration() -> Any { return 0 }
var redeclaredProp: some P { return 0 } // expected-note 3{{previously declared}}
var redeclaredProp: some P { return 0 } // expected-error{{redeclaration}}
@@ -283,9 +284,9 @@ var redeclaredProp: some Q { return 0 } // expected-error{{redeclaration}}
var redeclaredProp: P { return 0 } // expected-error{{redeclaration}}
struct RedeclarationTest {
func redeclaration() -> some P { return 0 } // expected-note{{previously declared}}
func redeclaration() -> some P { return 0 } // expected-note 2{{previously declared}}
func redeclaration() -> some P { return 0 } // expected-error{{redeclaration}}
func redeclaration() -> some Q { return 0 }
func redeclaration() -> some Q { return 0 } // expected-error{{redeclaration}}
func redeclaration() -> P { return 0 }
var redeclaredProp: some P { return 0 } // expected-note 3{{previously declared}}
@@ -293,9 +294,9 @@ struct RedeclarationTest {
var redeclaredProp: some Q { return 0 } // expected-error{{redeclaration}}
var redeclaredProp: P { return 0 } // expected-error{{redeclaration}}
subscript(redeclared _: Int) -> some P { return 0 } // expected-note{{previously declared}}
subscript(redeclared _: Int) -> some P { return 0 } // expected-note 2{{previously declared}}
subscript(redeclared _: Int) -> some P { return 0 } // expected-error{{redeclaration}}
subscript(redeclared _: Int) -> some Q { return 0 }
subscript(redeclared _: Int) -> some Q { return 0 } // expected-error{{redeclaration}}
subscript(redeclared _: Int) -> P { return 0 }
}