[NI] Strip only Exact-annotation preserving others during inference

core/descriptors/src/org/jetbrains/kotlin/resolve/annotationsForResolve.kt

@@ -28,6 +28,8 @@ fun KotlinType.hasNoInferAnnotation(): Boolean = annotations.hasAnnotation(NO_IN
 
 fun KotlinType.hasExactAnnotation(): Boolean = annotations.hasAnnotation(EXACT_ANNOTATION_FQ_NAME)
 
+fun AnnotationDescriptor.isExactAnnotation(): Boolean = this.fqName == EXACT_ANNOTATION_FQ_NAME
+
 fun Annotations.hasInternalAnnotationForResolve(): Boolean =
         hasAnnotation(NO_INFER_ANNOTATION_FQ_NAME) || hasAnnotation(EXACT_ANNOTATION_FQ_NAME)
 

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -8,11 +8,13 @@ package org.jetbrains.kotlin.types.checker
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns.FQ_NAMES
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.resolve.calls.inference.CapturedType
 import org.jetbrains.kotlin.resolve.descriptorUtil.hasExactAnnotation
 import org.jetbrains.kotlin.resolve.descriptorUtil.hasNoInferAnnotation
 import org.jetbrains.kotlin.resolve.constants.IntegerLiteralTypeConstructor
+import org.jetbrains.kotlin.resolve.descriptorUtil.isExactAnnotation
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.model.*
 import org.jetbrains.kotlin.types.model.CaptureStatus
@@ -343,6 +345,12 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext {
         return this.replaceAnnotations(Annotations.EMPTY)
     }
 
+    override fun KotlinTypeMarker.removeExactAnnotation(): KotlinTypeMarker {
+        require(this is UnwrappedType, this::errorMessage)
+        val annotationsWithoutExact = this.annotations.filterNot(AnnotationDescriptor::isExactAnnotation)
+        return this.replaceAnnotations(Annotations.create(annotationsWithoutExact))
+    }
+
     override fun KotlinTypeMarker.hasExactAnnotation(): Boolean {
         require(this is UnwrappedType, this::errorMessage)
         return hasExactInternal(this)

core/type-system/src/org/jetbrains/kotlin/types/model/TypeSystemContext.kt

@@ -107,6 +107,7 @@ interface TypeSystemInferenceExtensionContext : TypeSystemContext, TypeSystemBui
 
 
     fun KotlinTypeMarker.removeAnnotations(): KotlinTypeMarker
+    fun KotlinTypeMarker.removeExactAnnotation(): KotlinTypeMarker
 
     fun SimpleTypeMarker.replaceArguments(newArguments: List<TypeArgumentMarker>): SimpleTypeMarker