[FIR] Add temporary debug output to better understand CME on TeamCity

This commit should be reverted as soon as the reason for those
exceptions is found and fixed.

Tracking issue is KTIJ-21791

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/util/FirElementFinder.kt

@@ -7,7 +7,10 @@ package org.jetbrains.kotlin.analysis.low.level.api.fir.util
 
 import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.declarations.FirFile
+import org.jetbrains.kotlin.fir.declarations.FirRegularClass
+import org.jetbrains.kotlin.fir.declarations.utils.classId
 import org.jetbrains.kotlin.fir.psi
+import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.visitors.FirVisitorVoid
 import org.jetbrains.kotlin.psi.KtElement
 
@@ -33,6 +36,28 @@ object FirElementFinder {
                     }
                 }
             }
+
+            override fun visitRegularClass(regularClass: FirRegularClass) {
+                // Checking the rest super types that weren't resolved on the first OUTER_CLASS_ARGUMENTS_REQUIRED check in FirTypeResolver
+                val oldResolvePhase = regularClass.resolvePhase
+                val oldList = regularClass.superTypeRefs.toList()
+
+                try {
+                    super.visitRegularClass(regularClass)
+                } catch (e: ConcurrentModificationException) {
+                    val newResolvePhase = regularClass.resolvePhase
+                    val newList = regularClass.superTypeRefs.toList()
+
+                    throw IllegalStateException(
+                        """
+                        CME while traversing superTypeRefs of declaration=${regularClass.render()}:
+                        classId: ${regularClass.classId},
+                        oldPhase: $oldResolvePhase, oldList: ${oldList.joinToString(",", "[", "]") { it.render() }},
+                        newPhase: $newResolvePhase, newList: ${newList.joinToString(",", "[", "]") { it.render() }}
+                        """.trimIndent(), e
+                    )
+                }
+            }
         })
         return result
     }

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirOuterClassArgumentsRequiredChecker.kt

@@ -11,6 +11,8 @@ import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
 import org.jetbrains.kotlin.fir.analysis.checkers.extractArgumentsTypeRefAndSource
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
 import org.jetbrains.kotlin.fir.declarations.FirRegularClass
+import org.jetbrains.kotlin.fir.declarations.utils.classId
+import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.resolve.isValidTypeParameterFromOuterDeclaration
 import org.jetbrains.kotlin.fir.resolve.toSymbol
 import org.jetbrains.kotlin.fir.resolve.toTypeProjections
@@ -20,8 +22,25 @@ import org.jetbrains.kotlin.fir.types.*
 object FirOuterClassArgumentsRequiredChecker : FirRegularClassChecker() {
     override fun check(declaration: FirRegularClass, context: CheckerContext, reporter: DiagnosticReporter) {
         // Checking the rest super types that weren't resolved on the first OUTER_CLASS_ARGUMENTS_REQUIRED check in FirTypeResolver
-        for (superTypeRef in declaration.superTypeRefs) {
-            checkOuterClassArgumentsRequired(superTypeRef, declaration, context, reporter)
+        val oldResolvePhase = declaration.resolvePhase
+        val oldList = declaration.superTypeRefs.toList()
+
+        try {
+            for (superTypeRef in declaration.superTypeRefs) {
+                checkOuterClassArgumentsRequired(superTypeRef, declaration, context, reporter)
+            }
+        } catch (e: ConcurrentModificationException) {
+            val newResolvePhase = declaration.resolvePhase
+            val newList = declaration.superTypeRefs.toList()
+
+            throw IllegalStateException(
+                """
+                CME while traversing superTypeRefs of declaration=${declaration.render()}:
+                classId: ${declaration.classId},
+                oldPhase: $oldResolvePhase, oldList: ${oldList.joinToString { it.render() }},
+                newPhase: $newResolvePhase, newList: ${newList.joinToString { it.render() }}
+                """.trimIndent(), e
+            )
         }
     }