in javac-ast-extension/src/org/jetbrains/jps/javac/ast/api/JavacFileData.java [287:294]
private static Set<JavacRef> readImplicitToString(@NotNull DataInputStream in) throws IOException {
int size = ((DataInput)in).readInt();
final Set<JavacRef> result = new HashSet<>(size);
while (size-- > 0) {
result.add(readJavacRef(in));
}
return result;
}