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[ConstraintSystem] Don't increase a score for conditional requirement failures

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Let's consider conditional requirement failure to mean that parent
conformance requirement wasn't satisfied and nothing more, that helps
to disambiguate certain situations and avoid filtering out conditional
failures.

Resolves: rdar://problem/64844584
This commit is contained in:
Pavel Yaskevich
2020-11-06 12:06:00 -08:00
parent 2e2792e3e3
commit 66fbdce2f8
7 changed files with 13 additions and 26 deletions
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3
test/stdlib/ArrayDiagnostics.swift
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@@ -4,5 +4,6 @@ class NotEquatable {}
func test_ArrayOfNotEquatableIsNotEquatable() {
var a = [ NotEquatable(), NotEquatable() ]
if a == a {} // expected-error {{referencing operator function '==' on 'Array' requires that 'NotEquatable' conform to 'Equatable'}}
// There is also a note attached to declaration - requirement from conditional conformance of '[NotEquatable]' to 'Equatable'
if a == a {} // expected-error {{operator function '==' requires that 'NotEquatable' conform to 'Equatable'}}
}