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[Diagnostics] Treat type requirement failures associated with Self = Any as unrelated

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This helps us to filter out cases like operator overloads where
`Self` type comes from e.g. default for collection element -
`[1, "hello"].map { $0 + 1 }`. Main problem here is that
collection type couldn't be determined without unification to
`Any` and `+` failing for all numeric overloads is just a consequence.
This commit is contained in:
Pavel Yaskevich
2019-08-29 15:27:29 -07:00
parent facd27fc45
commit ecf8146938
2 changed files with 19 additions and 3 deletions
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19
lib/Sema/CSSimplify.cpp
View File

@@ -3832,8 +3832,8 @@ ConstraintSystem::SolutionKind ConstraintSystem::simplifyConformsToConstraint(
ConstraintKind kind,
ConstraintLocatorBuilder locator,
TypeMatchOptions flags) {
auto *typeVar = type->getAs<TypeVariableType>();
if (shouldAttemptFixes()) {
auto *typeVar = type->getAs<TypeVariableType>();
// If type variable, associated with this conformance check,
// has been determined to be a "hole" in constraint system,
// let's consider this check a success without recording
@@ -3983,6 +3983,23 @@ ConstraintSystem::SolutionKind ConstraintSystem::simplifyConformsToConstraint(
return SolutionKind::Error;
if (path.back().is<LocatorPathElt::AnyRequirement>()) {
// If this is a requirement associated with `Self` which is bound
// to `Any`, let's consider this "too incorrect" to continue.
//
// This helps us to filter out cases like operator overloads where
// `Self` type comes from e.g. default for collection element -
// `[1, "hello"].map { $0 + 1 }`. Main problem here is that
// collection type couldn't be determined without unification to
// `Any` and `+` failing for all numeric overloads is just a consequence.
if (typeVar && type->isAny()) {
auto *GP = typeVar->getImpl().getGenericParameter();
if (auto *GPD = GP->getDecl()) {
auto *DC = GPD->getDeclContext();
if (DC->isTypeContext() && DC->getSelfInterfaceType()->isEqual(GP))
return SolutionKind::Error;
}
}
if (auto *fix =
fixRequirementFailure(*this, type, protocolTy, anchor, path)) {
if (!recordFix(fix)) {

3
test/Constraints/closures.swift
View File

@@ -182,8 +182,7 @@ func r22162441(_ lines: [String]) {
func testMap() {
let a = 42
[1,a].map { $0 + 1.0 } // expected-error {{binary operator '+' cannot be applied to operands of type 'Any' and 'Double'}}
// expected-note @-1 {{expected an argument list of type '(Double, Double)'}}
[1,a].map { $0 + 1.0 } // expected-error {{cannot convert value of type 'Int' to expected element type 'Double'}}
}
// <rdar://problem/22414757> "UnresolvedDot" "in wrong phase" assertion from verifier