}

internal val KotlinType.ktNullability: KtTypeNullability
    get() = when {
        this.isNullabilityFlexible() -> KtTypeNullability.UNKNOWN
        this.isMarkedNullable -> KtTypeNullability.NULLABLE
        else -> KtTypeNullability.NON_NULLABLE
    }

internal val DeclarationDescriptorWithVisibility.ktVisibility: Visibility
    get() = when (visibility) {
        DescriptorVisibilities.PUBLIC -> Visibilities.Public

        IncorrectRightComponentOfIntersectionImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.NULLABLE_ON_DEFINITELY_NOT_NULLABLE) { firDiagnostic ->
        NullableOnDefinitelyNotNullableImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }

internal class CannotInferVisibilityImpl(
    override val callable: KtCallableSymbol,
    firDiagnostic: KtPsiDiagnostic,
    token: KtLifetimeToken,
) : KtAbstractFirDiagnostic<KtDeclaration>(firDiagnostic, token), KtFirDiagnostic.CannotInferVisibility

internal class CannotInferVisibilityWarningImpl(
    override val callable: KtCallableSymbol,
    firDiagnostic: KtPsiDiagnostic,
    token: KtLifetimeToken,

     *
     * Relies on the fact that in such references only the last qualifier refers to the
     * actual extension callable, and the part before that refers to the receiver type (either fully
     * or partially qualified).
     *
     * For example, `foo.Foo.bar` may only refer to the extension callable `bar` with
     * a `foo.Foo` receiver type, and this function will only look for such combinations.
     *

        return importAffectsUsagesOfClassesWithSameName(classToImport, importAllInParent)
    }

    /**
     * Same as above, but for more general callable symbols.
     *
     * Currently only checks constructor calls, assuming `true` for everything else.
     */

            Errors.NAMED_PARAMETER_NOT_FOUND,
            Errors.NAMED_ARGUMENTS_NOT_ALLOWED,
            Errors.VARARG_OUTSIDE_PARENTHESES,
            Errors.SPREAD_OF_NULLABLE,
            Errors.SPREAD_OF_LAMBDA_OR_CALLABLE_REFERENCE,
            Errors.MANY_LAMBDA_EXPRESSION_ARGUMENTS,
            Errors.UNEXPECTED_TRAILING_LAMBDA_ON_A_NEW_LINE,
            Errors.TOO_MANY_ARGUMENTS,

                    return firSymbolBuilder.buildSymbol(outerFirClassifier) as? KtDeclarationSymbol
                }

                if (firSymbol.origin == FirDeclarationOrigin.DynamicScope) {
                    // A callable declaration from dynamic scope has no containing declaration as it comes from a dynamic type
                    // which is not based on a specific classifier
                    return null
                }
            }

        val type = getExpectedType(binaryExpression) ?: getElvisOperandExpectedTypeByOtherOperand(expression, binaryExpression)

        return type?.applyIf(expression == binaryExpression.left) { withNullability(ConeNullability.NULLABLE) }
    }

    private fun getElvisOperandExpectedTypeByOtherOperand(operand: KtExpression, elvisExpression: KtBinaryExpression): KtType? {
        val leftOperand = elvisExpression.left ?: return null

                        unmappedCount -= 1
                        // Here we intentionally use the 'Optional' wrapper to make 'computeIfAbsent' work smoothly
                        Optional.ofNullable(computeTarget(element))
                    }
                }

                if (unmappedCount > 0) {
                    element.acceptChildren(this)
                }
            }
        }

                    is FirResolvedNamedReference -> when (calleeReference.resolvedSymbol) {
                        // `calleeReference.resolvedSymbol` isn't guaranteed to be callable. For example, function type parameters used in
                        // expression positions (e.g. `T` in `println(T)`) are parsed as `KtSimpleNameExpression` and built into