https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
interface com.google.common.base.Suppliers$SupplierFunction<T> extends com.google.common.base.Function<com.google.common.base.Supplier<T>, T>
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.base.Suppliers$SupplierFunction
  super_class: java.lang.Object
{
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Lcom/google/common/base/Function<Lcom/google/common/base/Supplier<TT;>;TT;>;
SourceFile: "Suppliers.java"
NestHost: com.google.common.base.Suppliers
InnerClasses:
  private abstract SupplierFunction = com.google.common.base.Suppliers$SupplierFunction of com.google.common.base.Suppliers