String fileEncoding = getEncoding();
if (fileEncoding == null) {
fileEncoding = CeylonConfig.get(DefaultToolOptions.DEFAULTS_ENCODING);
}
if (fileEncoding != null) {
builder.encoding(fileEncoding);
}
typeChecker = builder.getTypeChecker();
// collect all units we are typechecking
initTypeCheckedUnits(typeChecker);