Debugger: Allow to touch experimental stuff from evaluator (KT-30216)

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluationBuilder.kt

@@ -383,7 +383,8 @@ class KotlinEvaluator(val codeFragment: KtCodeFragment, val sourcePosition: Sour
     override fun getModifier() = null
 
     companion object {
-        private val IGNORED_DIAGNOSTICS: Set<DiagnosticFactory<*>> = Errors.INVISIBLE_REFERENCE_DIAGNOSTICS
+        private val IGNORED_DIAGNOSTICS: Set<DiagnosticFactory<*>> =
+            Errors.INVISIBLE_REFERENCE_DIAGNOSTICS + setOf(Errors.EXPERIMENTAL_API_USAGE_ERROR)
 
         private val DEFAULT_METHOD_MARKERS = listOf(AsmTypes.OBJECT_TYPE, AsmTypes.DEFAULT_CONSTRUCTOR_MARKER)
 

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/experimentalApi.kt

@@ -0,0 +1,15 @@
+package experimentalApi
+
+@Experimental(Experimental.Level.ERROR)
+annotation class UnstableApi
+
+@UnstableApi
+fun foo() = 5
+
+fun main() {
+    //Breakpoint!
+    val a = 5
+}
+
+// EXPRESSION: foo()
+// RESULT: 5: I

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/experimentalApi.out

@@ -0,0 +1,8 @@
+LineBreakpoint created at experimentalApi.kt:11
+Run Java
+Connected to the target VM
+experimentalApi.kt:11
+Compile bytecode for foo()
+Disconnected from the target VM
+
+Process finished with exit code 0

idea/tests/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluateExpressionTestGenerated.java

@@ -141,6 +141,11 @@ public class KotlinEvaluateExpressionTestGenerated extends AbstractKotlinEvaluat
             runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/escapedNames.kt");
         }
 
+        @TestMetadata("experimentalApi.kt")
+        public void testExperimentalApi() throws Exception {
+            runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/experimentalApi.kt");
+        }
+
         @TestMetadata("extractLocalVariables.kt")
         public void testExtractLocalVariables() throws Exception {
             runTest("idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/extractLocalVariables.kt");