averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-14 20:36:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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)) {