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// RUN: %target-swift-frontend -typecheck -verify -swift-version 4 %s
protocol P {}
struct Foo {
mutating func boom() {}
}
let x = Foo.boom // expected-warning{{cannot reference 'mutating' method as function value; calling the function has undefined behavior and will be an error in future Swift versions}}
var y = Foo()
let z0 = y.boom // expected-error{{cannot reference 'mutating' method as function value}}
let z1 = Foo.boom(&y) // expected-error{{cannot reference 'mutating' method as function value}}
func fromLocalContext() -> (inout Foo) -> () -> () {
return Foo.boom // expected-warning{{cannot reference 'mutating' method as function value; calling the function has undefined behavior and will be an error in future Swift versions}}
}
func fromLocalContext2(x: inout Foo, y: Bool) -> () -> () {
if y {
return x.boom // expected-error{{cannot reference 'mutating' method as function value}}
} else {
return Foo.boom(&x) // expected-error{{cannot reference 'mutating' method as function value}}
}
}
func bar() -> P.Type { fatalError() }
func bar() -> Foo.Type { fatalError() }
_ = bar().boom // expected-warning{{cannot reference 'mutating' method as function value; calling the function has undefined behavior and will be an error in future Swift versions}}
_ = bar().boom(&y) // expected-error{{cannot reference 'mutating' method as function value}}
_ = bar().boom(&y)() // expected-error{{cannot reference 'mutating' method as function value}}
func foo(_ foo: Foo.Type) {
_ = foo.boom // expected-warning{{cannot reference 'mutating' method as function value; calling the function has undefined behavior and will be an error in future Swift versions}}
_ = foo.boom(&y) // expected-error{{cannot reference 'mutating' method as function value}}
_ = foo.boom(&y)() // expected-error{{cannot reference 'mutating' method as function value}}
}
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