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The main problem here is that moduleName that is being passed to KPackageImpl is useless: as can be seen in ClosureCodegen.generateCallableReferenceDeclarationContainer, the name of the current module is always written to the class file for a callable reference, not the name of the module of the referenced declaration. This resulted in reflection not loading the correct .kotlin_module file and subsequently not finding the required file facade for a top-level function. The commit does not fix the issue with the incorrect module name written in the back-end, but workarounds it. It turns out, reflection can figure out the name of the module of the referenced declaration itself by parsing the header from the given java.lang.Class object for a single-file/multi-file package facade and extract the package_module_name protobuf extension. Similar code was already there in Member.getKPackage() in ReflectJvmMapping.kt but it did not support multi-file classes, of which there are a lot in the standard library; this is now supported #KT-12630 Fixed #KT-14731 Fixed