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Add Regression Tests for Bogus Existential Checked Casts #28627

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Merged
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Dec 7, 2019
Merged

Add Regression Tests for Bogus Existential Checked Casts #28627

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12 changes: 11 additions & 1 deletion test/decl/protocol/protocols.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -489,7 +489,17 @@ class C3 : P1 {} // expected-error{{type 'C3' does not conform to protocol 'P1'}
func h<T : C3>(_ x : T) {
_ = x as P1 // expected-error{{protocol 'P1' can only be used as a generic constraint because it has Self or associated type requirements}}
}

func i<T : C3>(_ x : T?) -> Bool {
return x is P1 // expected-error{{protocol 'P1' can only be used as a generic constraint because it has Self or associated type requirements}}
// FIXME: Bogus diagnostic. See SR-11920.
// expected-warning@-2 {{checking a value with optional type 'T?' against dynamic type 'P1' succeeds whenever the value is non-nil; did you mean to use '!= nil'?}}
}
func j(_ x : C1) -> Bool {
return x is P1 // expected-error{{protocol 'P1' can only be used as a generic constraint because it has Self or associated type requirements}}
}
func k(_ x : C1?) -> Bool {
return x is P1 // expected-error{{protocol 'P1' can only be used as a generic constraint because it has Self or associated type requirements}}
}


protocol P4 {
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