Do not report experimental usage errors in import statements

#KT-25545 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ExperimentalUsageChecker.kt

@@ -28,6 +28,7 @@ import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.getParentOfType
 import org.jetbrains.kotlin.psi.psiUtil.getTopmostParentQualifiedExpressionForSelector
 import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
@@ -263,9 +264,6 @@ class ExperimentalUsageChecker(project: Project) : CallChecker {
                 }
             }
 
-            val experimentalities = targetDescriptor.loadExperimentalities(moduleAnnotationsResolver, context.languageVersionSettings)
-            reportNotAcceptedExperimentalities(experimentalities, element, context)
-
             val targetClass = when (targetDescriptor) {
                 is ClassDescriptor -> targetDescriptor
                 is TypeAliasDescriptor -> targetDescriptor.classDescriptor
@@ -280,6 +278,11 @@ class ExperimentalUsageChecker(project: Project) : CallChecker {
                     )
                 }
             }
+
+            if (element.getParentOfType<KtImportDirective>(false) == null) {
+                val experimentalities = targetDescriptor.loadExperimentalities(moduleAnnotationsResolver, context.languageVersionSettings)
+                reportNotAcceptedExperimentalities(experimentalities, element, context)
+            }
         }
 
         private fun checkUsageOfKotlinExperimentalOrUseExperimental(element: PsiElement, context: CheckerContext) {

compiler/testData/diagnostics/testsWithStdLib/experimental/importStatement.kt

@@ -0,0 +1,27 @@
+// !USE_EXPERIMENTAL: kotlin.Experimental
+// FILE: api.kt
+
+package feature.experimental.self
+
+@Experimental
+annotation class ImportedMarker
+
+@ImportedMarker
+object ImportedClass {
+    @ImportedMarker
+    fun importedObjectMember() {}
+}
+
+@ImportedMarker
+fun importedFunction() {}
+
+@ImportedMarker
+val importedProperty = Unit
+
+// FILE: usage.kt
+
+import feature.experimental.self.ImportedMarker
+import feature.experimental.self.ImportedClass
+import feature.experimental.self.importedFunction
+import feature.experimental.self.importedProperty
+import feature.experimental.self.ImportedClass.importedObjectMember

compiler/testData/diagnostics/testsWithStdLib/experimental/importStatement.txt

@@ -0,0 +1,27 @@
+package
+
+package feature {
+
+    package feature.experimental {
+
+        package feature.experimental.self {
+            @feature.experimental.self.ImportedMarker public val importedProperty: kotlin.Unit
+            @feature.experimental.self.ImportedMarker public fun importedFunction(): kotlin.Unit
+
+            @feature.experimental.self.ImportedMarker public object ImportedClass {
+                private constructor ImportedClass()
+                public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+                public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+                @feature.experimental.self.ImportedMarker public final fun importedObjectMember(): kotlin.Unit
+                public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+            }
+
+            @kotlin.Experimental public final annotation class ImportedMarker : kotlin.Annotation {
+                public constructor ImportedMarker()
+                public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+                public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+                public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+            }
+        }
+    }
+}

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestWithStdLibGenerated.java

@@ -2407,6 +2407,11 @@ public class DiagnosticsTestWithStdLibGenerated extends AbstractDiagnosticsTestW
             runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/experimentalUnsignedLiterals.kt");
         }
 
+        @TestMetadata("importStatement.kt")
+        public void testImportStatement() throws Exception {
+            runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/importStatement.kt");
+        }
+
         @TestMetadata("incorrectTargetsForExperimentalAnnotation.kt")
         public void testIncorrectTargetsForExperimentalAnnotation() throws Exception {
             runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/incorrectTargetsForExperimentalAnnotation.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsTestWithStdLibUsingJavacGenerated.java

@@ -2407,6 +2407,11 @@ public class DiagnosticsTestWithStdLibUsingJavacGenerated extends AbstractDiagno
             runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/experimentalUnsignedLiterals.kt");
         }
 
+        @TestMetadata("importStatement.kt")
+        public void testImportStatement() throws Exception {
+            runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/importStatement.kt");
+        }
+
         @TestMetadata("incorrectTargetsForExperimentalAnnotation.kt")
         public void testIncorrectTargetsForExperimentalAnnotation() throws Exception {
             runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/incorrectTargetsForExperimentalAnnotation.kt");