FIR: keep names for error references

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirBodyResolveTransformer.kt

@@ -377,7 +377,8 @@ open class FirBodyResolveTransformer(val session: FirSession, val implicitTypeOn
                 FirErrorNamedReference(
                     namedReference.session,
                     namedReference.psi,
-                    "Inapplicable($applicability): ${candidates.map { describeSymbol(it.symbol) }}"
+                    "Inapplicable($applicability): ${candidates.map { describeSymbol(it.symbol) }}",
+                    namedReference.name
                 )
             }
             candidates.size == 1 -> FirNamedReferenceWithCandidate(
@@ -385,7 +386,8 @@ open class FirBodyResolveTransformer(val session: FirSession, val implicitTypeOn
                 name, candidates.single()
             )
             else -> FirErrorNamedReference(
-                namedReference.session, namedReference.psi, "Ambiguity: $name, ${candidates.map { describeSymbol(it.symbol) }}"
+                namedReference.session, namedReference.psi, "Ambiguity: $name, ${candidates.map { describeSymbol(it.symbol) }}",
+                namedReference.name
             )
         }
     }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.fir.expressions.*
 import org.jetbrains.kotlin.fir.expressions.impl.FirElseIfTrueCondition
 import org.jetbrains.kotlin.fir.expressions.impl.FirExpressionStub
 import org.jetbrains.kotlin.fir.expressions.impl.FirUnitExpression
+import org.jetbrains.kotlin.fir.references.FirErrorNamedReference
 import org.jetbrains.kotlin.fir.symbols.ConeCallableSymbol
 import org.jetbrains.kotlin.fir.symbols.ConeClassLikeSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
@@ -761,7 +762,11 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
     }
 
     override fun visitNamedReference(namedReference: FirNamedReference) {
-        print("${namedReference.name}#")
+        if (namedReference is FirErrorNamedReference) {
+            print("<${namedReference.errorReason}>#")
+        } else {
+            print("${namedReference.name}#")
+        }
     }
 
     override fun visitResolvedCallableReference(resolvedCallableReference: FirResolvedCallableReference) {

compiler/fir/tree/src/org/jetbrains/kotlin/fir/references/FirErrorNamedReference.kt

@@ -14,7 +14,6 @@ import org.jetbrains.kotlin.name.Name
 class FirErrorNamedReference(
     session: FirSession,
     psi: PsiElement?,
-    val errorReason: String
+    val errorReason: String,
-) : FirAbstractElement(session, psi), FirNamedReference {
     override val name: Name = Name.special("<$errorReason>")
-}
+) : FirAbstractElement(session, psi), FirNamedReference