QML files can't import from qrc:/

inserting

import "qrc:/"

in any qml file will trigger an assert in QQmlEngine.cpp

QQml_isFileCaseCorrect(const QString &fileName, int lengthIn /* = -1 */)

as it gets called with an empty string, which doesn't get checked:

if (absolute[0] == QLatin1Char(':'))

It is a regression as same source used to work in Qt 5.9

A workaround for now is to

import "qrc:/."