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//===--- UnresolvedMemberLookupTests.cpp --------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "SemaFixture.h"
#include "swift/Sema/ConstraintSystem.h"
using namespace swift;
using namespace swift::unittest;
using namespace swift::constraints;
TEST_F(SemaTest, TestLookupAlwaysLooksThroughOptionalBase) {
auto *intTypeDecl = getStdlibNominalTypeDecl("Int");
auto *optTypeDecl = getStdlibNominalTypeDecl("Optional");
auto intType = intTypeDecl->getDeclaredType();
auto intOptType = OptionalType::get(intType);
auto stringType = getStdlibType("String");
auto *intMember = addExtensionVarMember(intTypeDecl, "test", intOptType);
addExtensionVarMember(optTypeDecl, "test", stringType);
auto *UME = new (Context)
UnresolvedMemberExpr(SourceLoc(), DeclNameLoc(),
DeclNameRef(Context.getIdentifier("test")), true);
auto *UMCRE = new (Context) UnresolvedMemberChainResultExpr(UME, UME);
ConstraintSystem cs(DC, ConstraintSystemOptions());
auto *expr = cs.generateConstraints(UMCRE, DC);
ASSERT_TRUE(expr);
cs.addConstraint(
ConstraintKind::Conversion, cs.getType(expr), intOptType,
cs.getConstraintLocator(UMCRE, ConstraintLocator::ContextualType));
SmallVector<Solution, 2> solutions;
cs.solve(solutions);
// We should have a solution.
ASSERT_EQ(solutions.size(), 1u);
auto &solution = solutions[0];
auto *locator = cs.getConstraintLocator(UME,
ConstraintLocator::UnresolvedMember);
auto choice = solution.getOverloadChoice(locator).choice;
// The `test` member on `Int` should be selected.
ASSERT_EQ(choice.getDecl(), intMember);
}
TEST_F(SemaTest, TestLookupPrefersResultsOnOptionalRatherThanBase) {
auto *intTypeDecl = getStdlibNominalTypeDecl("Int");
auto *optTypeDecl = getStdlibNominalTypeDecl("Optional");
auto intType = intTypeDecl->getDeclaredType();
auto intOptType = OptionalType::get(intType);
addExtensionVarMember(intTypeDecl, "test", intOptType);
auto *optMember = addExtensionVarMember(optTypeDecl, "test", intType);
auto *UME = new (Context)
UnresolvedMemberExpr(SourceLoc(), DeclNameLoc(),
DeclNameRef(Context.getIdentifier("test")), true);
auto *UMCRE = new (Context) UnresolvedMemberChainResultExpr(UME, UME);
ConstraintSystem cs(DC, ConstraintSystemOptions());
auto *expr = cs.generateConstraints(UMCRE, DC);
ASSERT_TRUE(expr);
cs.addConstraint(
ConstraintKind::Conversion, cs.getType(expr), intOptType,
cs.getConstraintLocator(expr, ConstraintLocator::ContextualType));
SmallVector<Solution, 2> solutions;
cs.solve(solutions);
// We should have a solution.
ASSERT_EQ(solutions.size(), 1u);
auto &solution = solutions[0];
auto *locator = cs.getConstraintLocator(UME,
ConstraintLocator::UnresolvedMember);
auto choice = solution.getOverloadChoice(locator).choice;
auto score = solution.getFixedScore();
// The `test` member on `Optional` should be chosen over the member on `Int`,
// even though the score is otherwise worse.
ASSERT_EQ(score.Data[SK_ValueToOptional], 1u);
ASSERT_EQ(choice.getDecl(), optMember);
}
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