Fix KotlinTypeCheckerTest in accordance with NI intersections

compiler/frontend/src/org/jetbrains/kotlin/resolve/TypeResolutionContext.java

@@ -24,11 +24,12 @@ public class TypeResolutionContext {
     public final BindingTrace trace;
     public final boolean checkBounds;
     public final boolean allowBareTypes;
+    public final boolean allowIntersectionTypes;
     public final boolean isDebuggerContext;
     public final boolean abbreviated;
 
     public TypeResolutionContext(@NotNull LexicalScope scope, @NotNull BindingTrace trace, boolean checkBounds, boolean allowBareTypes, boolean isDebuggerContext) {
-        this(scope, trace, checkBounds, allowBareTypes, isDebuggerContext, false);
+        this(scope, trace, checkBounds, allowBareTypes, isDebuggerContext, false, false);
     }
 
     public TypeResolutionContext(
@@ -38,6 +39,18 @@ public class TypeResolutionContext {
             boolean allowBareTypes,
             boolean isDebuggerContext,
             boolean abbreviated
+    ) {
+        this(scope, trace, checkBounds, allowBareTypes, isDebuggerContext, abbreviated, false);
+    }
+
+    public TypeResolutionContext(
+            @NotNull LexicalScope scope,
+            @NotNull BindingTrace trace,
+            boolean checkBounds,
+            boolean allowBareTypes,
+            boolean isDebuggerContext,
+            boolean abbreviated,
+            boolean allowIntersectionTypes
     ) {
         this.scope = scope;
         this.trace = trace;
@@ -45,10 +58,11 @@ public class TypeResolutionContext {
         this.allowBareTypes = allowBareTypes;
         this.isDebuggerContext = isDebuggerContext;
         this.abbreviated = abbreviated;
+        this.allowIntersectionTypes = allowIntersectionTypes;
     }
 
     @NotNull
     public TypeResolutionContext noBareTypes() {
-        return new TypeResolutionContext(scope, trace, checkBounds, false, isDebuggerContext, abbreviated);
+        return new TypeResolutionContext(scope, trace, checkBounds, false, isDebuggerContext, abbreviated, allowIntersectionTypes);
     }
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/TypeResolver.kt

@@ -86,6 +86,14 @@ class TypeResolver(
         open fun transformType(kotlinType: KotlinType): KotlinType? = null
     }
 
+    // Entry point for KotlinTypeCheckerTest
+    fun resolveTypeWithPossibleIntersections(scope: LexicalScope, typeReference: KtTypeReference, trace: BindingTrace): KotlinType {
+        return resolveType(
+            TypeResolutionContext(scope, trace, false, false, typeReference.suppressDiagnosticsInDebugMode(), false, true),
+            typeReference
+        )
+    }
+
     fun resolveType(scope: LexicalScope, typeReference: KtTypeReference, trace: BindingTrace, checkBounds: Boolean): KotlinType {
         // bare types are not allowed
         return resolveType(
@@ -322,37 +330,41 @@ class TypeResolver(
                     }
                 }
 
-                if (!languageVersionSettings.supportsFeature(LanguageFeature.DefinitelyNonNullableTypes)) {
-                    c.trace.report(
-                        UNSUPPORTED_FEATURE.on(
-                            intersectionType,
-                            LanguageFeature.DefinitelyNonNullableTypes to languageVersionSettings
+                if (!c.allowIntersectionTypes) {
+                    if (!languageVersionSettings.supportsFeature(LanguageFeature.DefinitelyNonNullableTypes)) {
+                        c.trace.report(
+                            UNSUPPORTED_FEATURE.on(
+                                intersectionType,
+                                LanguageFeature.DefinitelyNonNullableTypes to languageVersionSettings
+                            )
                         )
-                    )
-                    return
+                        return
+                    }
+
+                    if (!leftType.isTypeParameter() || leftType.isMarkedNullable || !leftType.isNullableOrUninitializedTypeParameter()) {
+                        c.trace.report(INCORRECT_LEFT_COMPONENT_OF_INTERSECTION.on(intersectionType.getLeftTypeRef()!!))
+                        return
+                    }
+
+                    if (!rightType.isAny()) {
+                        c.trace.report(INCORRECT_RIGHT_COMPONENT_OF_INTERSECTION.on(intersectionType.getRightTypeRef()!!))
+                        return
+                    }
+
+                    val definitelyNotNullType =
+                        DefinitelyNotNullType.makeDefinitelyNotNull(leftType.unwrap())
+                            ?: error(
+                                "Definitely not-nullable type is not created for type parameter with nullable upper bound ${
+                                    TypeUtils.getTypeParameterDescriptorOrNull(
+                                        leftType
+                                    )!!
+                                }"
+                            )
+
+                    result = type(definitelyNotNullType)
+                } else {
+                    result = type(IntersectionTypeConstructor(listOf(leftType, rightType)).createType())
                 }
-
-                if (!leftType.isTypeParameter() || leftType.isMarkedNullable || !leftType.isNullableOrUninitializedTypeParameter()) {
-                    c.trace.report(INCORRECT_LEFT_COMPONENT_OF_INTERSECTION.on(intersectionType.getLeftTypeRef()!!))
-                    return
-                }
-
-                if (!rightType.isAny()) {
-                    c.trace.report(INCORRECT_RIGHT_COMPONENT_OF_INTERSECTION.on(intersectionType.getRightTypeRef()!!))
-                    return
-                }
-
-                val definitelyNotNullType =
-                    DefinitelyNotNullType.makeDefinitelyNotNull(leftType.unwrap())
-                        ?: error(
-                            "Definitely not-nullable type is not created for type parameter with nullable upper bound ${
-                                TypeUtils.getTypeParameterDescriptorOrNull(
-                                    leftType
-                                )!!
-                            }"
-                        )
-
-                result = type(definitelyNotNullType)
             }
 
             private fun KotlinType.isNullableOrUninitializedTypeParameter(): Boolean {

compiler/tests/org/jetbrains/kotlin/types/KotlinTypeCheckerTest.java

@@ -28,8 +28,10 @@ import org.jetbrains.kotlin.descriptors.impl.ReceiverParameterDescriptorImpl;
 import org.jetbrains.kotlin.psi.KtExpression;
 import org.jetbrains.kotlin.psi.KtFile;
 import org.jetbrains.kotlin.psi.KtPsiFactoryKt;
+import org.jetbrains.kotlin.psi.KtTypeReference;
 import org.jetbrains.kotlin.resolve.BindingContext;
 import org.jetbrains.kotlin.resolve.BindingTraceContext;
+import org.jetbrains.kotlin.resolve.TypeResolutionContext;
 import org.jetbrains.kotlin.resolve.TypeResolver;
 import org.jetbrains.kotlin.resolve.calls.components.InferenceSession;
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfoFactory;
@@ -174,7 +176,7 @@ public class KotlinTypeCheckerTest extends KotlinTestWithEnvironment {
         assertCommonSupertype("Derived_T<Int>", "DDerived_T<Int>", "Derived_T<Int>");
         assertCommonSupertype("Derived_T<Int>", "DDerived_T<Int>", "DDerived1_T<Int>");
 
-        assertCommonSupertype("Comparable<*>", "Comparable<Int>", "Comparable<Boolean>");
+        assertCommonSupertype("Comparable<Boolean & Int>", "Comparable<Int>", "Comparable<Boolean>");
         assertCommonSupertype("Base_T<out I>", "Base_T<AI>", "Base_T<BI>");
         assertCommonSupertype("Base_T<in Int>", "Base_T<Int>", "Base_T<in Int>");
         assertCommonSupertype("Base_T<in Int>", "Derived_T<Int>", "Base_T<in Int>");
@@ -585,6 +587,7 @@ public class KotlinTypeCheckerTest extends KotlinTestWithEnvironment {
     }
 
     private KotlinType makeType(LexicalScope scope, String typeStr) {
-        return typeResolver.resolveType(scope, KtPsiFactoryKt.KtPsiFactory(getProject()).createType(typeStr), DummyTraces.DUMMY_TRACE, true);
+        KtTypeReference typeReference = KtPsiFactoryKt.KtPsiFactory(getProject()).createType(typeStr);
+        return typeResolver.resolveTypeWithPossibleIntersections(scope, typeReference, DummyTraces.DUMMY_TRACE);
     }
 }