Fix corner-cases in ConeTypeContext / FIR builder / FIR enhancements

This fixes a pack of FIR smoke diagnostic tests, now all of them pass
Related to KT-29962

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/enhancement/javaTypeUtils.kt

@@ -146,7 +146,9 @@ private fun JavaClassifierType.enhanceInflexibleType(
                     mappedId = mappedId.readOnlyToMutable() ?: mappedId
                 }
             }
-            session.service<FirSymbolProvider>().getClassLikeSymbolByFqName(mappedId ?: classId)!!
+            val kotlinClassId = mappedId ?: classId
+            session.service<FirSymbolProvider>().getClassLikeSymbolByFqName(kotlinClassId)
+                ?: return ConeClassErrorType("Cannot find class-like symbol for $kotlinClassId during enhancement")
         }
         is JavaTypeParameter -> createTypeParameterSymbol(session, classifier.name)
         else -> return toNotNullConeKotlinType(session)

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassEnhancementScope.kt

@@ -198,6 +198,7 @@ class JavaClassEnhancementScope(
     }
 
     private fun StringBuilder.appendConeType(coneType: ConeKotlinType) {
+        if (coneType is ConeClassErrorType) return
         append("L")
         when (coneType) {
             is ConeClassLikeType -> {

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/ConversionUtils.kt

@@ -110,9 +110,11 @@ internal fun generateConstantExpressionByLiteral(session: FirSession, expression
                 FirConstExpressionImpl(
                     session, expression, IrConstKind.Long, convertedText, "Incorrect long: $text"
                 )
-            } else {
+            } else if (convertedText is Number) {
                 // TODO: support byte / short
-                FirConstExpressionImpl(session, expression, IrConstKind.Int, (convertedText as Number).toInt(), "Incorrect int: $text")
+                FirConstExpressionImpl(session, expression, IrConstKind.Int, convertedText.toInt(), "Incorrect int: $text")
+            } else {
+                FirErrorExpressionImpl(session, expression, reason = "Incorrect constant expression: $text")
             }
         KtNodeTypes.FLOAT_CONSTANT ->
             if (convertedText is Float) {
@@ -175,7 +177,9 @@ internal fun IElementType.toFirOperation(): FirOperation =
         else -> throw AssertionError(this.toString())
     }
 
-internal fun FirExpression.generateNotNullOrOther(session: FirSession, other: FirExpression, caseId: String, basePsi: KtElement): FirWhenExpression {
+internal fun FirExpression.generateNotNullOrOther(
+    session: FirSession, other: FirExpression, caseId: String, basePsi: KtElement
+): FirWhenExpression {
     val subjectName = Name.special("<$caseId>")
     val subjectVariable = generateTemporaryVariable(session, psi, subjectName, this)
     val subjectExpression = FirWhenSubjectExpression(session, psi)

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -106,6 +106,19 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
         private fun KtExpression.toFirStatement(): FirStatement =
             convert()
 
+        private fun KtDeclaration.toFirDeclaration(
+            delegatedSuperType: FirTypeRef?, delegatedSelfType: FirTypeRef, hasPrimaryConstructor: Boolean
+        ): FirDeclaration {
+            return when (this) {
+                is KtSecondaryConstructor -> toFirConstructor(
+                    delegatedSuperType,
+                    delegatedSelfType,
+                    hasPrimaryConstructor
+                )
+                else -> convert<FirDeclaration>()
+            }
+        }
+
         private fun KtExpression?.toFirBlock(): FirBlock =
             when (this) {
                 is KtBlockExpression ->
@@ -413,14 +426,9 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
                 val delegatedSelfType = enumEntry.toDelegatedSelfType()
                 val delegatedSuperType = enumEntry.extractSuperTypeListEntriesTo(firEnumEntry, delegatedSelfType)
                 for (declaration in enumEntry.declarations) {
-                    firEnumEntry.declarations += when (declaration) {
-                        is KtSecondaryConstructor -> declaration.toFirConstructor(
-                            delegatedSuperType,
-                            delegatedSelfType,
-                            hasPrimaryConstructor = true
-                        )
-                        else -> declaration.convert<FirDeclaration>()
-                    }
+                    firEnumEntry.declarations += declaration.toFirDeclaration(
+                        delegatedSuperType, delegatedSelfType, hasPrimaryConstructor = true
+                    )
                 }
                 firEnumEntry
             }
@@ -484,14 +492,9 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
                 }
 
                 for (declaration in classOrObject.declarations) {
-                    firClass.declarations += when (declaration) {
-                        is KtSecondaryConstructor -> declaration.toFirConstructor(
-                            delegatedSuperType,
-                            delegatedSelfType,
-                            classOrObject.primaryConstructor != null
-                        )
-                        else -> declaration.convert<FirDeclaration>()
-                    }
+                    firClass.declarations += declaration.toFirDeclaration(
+                        delegatedSuperType, delegatedSelfType, hasPrimaryConstructor = classOrObject.primaryConstructor != null
+                    )
                 }
 
                 firClass
@@ -506,7 +509,9 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
                 objectDeclaration.extractSuperTypeListEntriesTo(this, delegatedSelfType)
 
                 for (declaration in objectDeclaration.declarations) {
-                    declarations += declaration.convert<FirDeclaration>()
+                    declarations += declaration.toFirDeclaration(
+                        delegatedSuperType = null, delegatedSelfType = delegatedSelfType, hasPrimaryConstructor = false
+                    )
                 }
             }
         }
@@ -1278,9 +1283,11 @@ class RawFirBuilder(val session: FirSession, val stubMode: Boolean) {
         override fun visitQualifiedExpression(expression: KtQualifiedExpression, data: Unit): FirElement {
             val selector = expression.selectorExpression
                 ?: return FirErrorExpressionImpl(session, expression, "Qualified expression without selector")
-            val firSelector = selector.toFirExpression("Incorrect selector expression") as FirModifiableQualifiedAccess
-            firSelector.safe = expression is KtSafeQualifiedExpression
-            firSelector.explicitReceiver = expression.receiverExpression.toFirExpression("Incorrect receiver expression")
+            val firSelector = selector.toFirExpression("Incorrect selector expression")
+            if (firSelector is FirModifiableQualifiedAccess) {
+                firSelector.safe = expression is KtSafeQualifiedExpression
+                firSelector.explicitReceiver = expression.receiverExpression.toFirExpression("Incorrect receiver expression")
+            }
             return firSelector
         }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/types/ConeTypeContext.kt

@@ -106,6 +106,7 @@ interface ConeTypeContext : TypeSystemContext, TypeSystemOptimizationContext {
 
     override fun SimpleTypeMarker.typeConstructor(): TypeConstructorMarker {
         require(this is ConeLookupTagBasedType)
+        if (this is ConeClassErrorType) return ErrorTypeConstructor("No constructor: $reason")
         return this.lookupTag.toSymbol(session) ?: ErrorTypeConstructor("Unresolved: ${this.lookupTag}")
     }
 
@@ -214,8 +215,9 @@ interface ConeTypeContext : TypeSystemContext, TypeSystemOptimizationContext {
     }
 
     override fun isEqualTypeConstructors(c1: TypeConstructorMarker, c2: TypeConstructorMarker): Boolean {
-        assert(c1 is ConeSymbol)
-        assert(c2 is ConeSymbol)
+        if (c1 is ErrorTypeConstructor || c2 is ErrorTypeConstructor) return false
+        require(c1 is ConeSymbol)
+        require(c2 is ConeSymbol)
         return c1 == c2
     }