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1// RUN: rm -rf %t2// RUN: mkdir -p %t3// RUN: split-file %s %t4//5// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/Cache.cppm -o %t/Cache.pcm6// RUN: %clang_cc1 -std=c++20 %t/Use.cpp -fmodule-file=Fibonacci.Cache=%t/Cache.pcm \7// RUN: -fsyntax-only -verify8 9// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/Cache.cppm -o %t/Cache.pcm10// RUN: %clang_cc1 -std=c++20 %t/Use.cpp -fmodule-file=Fibonacci.Cache=%t/Cache.pcm \11// RUN: -fsyntax-only -verify12 13//--- Cache.cppm14export module Fibonacci.Cache;15 16export namespace Fibonacci17{18 constexpr unsigned long Recursive(unsigned long n)19 {20 if (n == 0)21 return 0;22 if (n == 1)23 return 1;24 return Recursive(n - 2) + Recursive(n - 1);25 }26 27 template<unsigned long N>28 struct Number{};29 30 struct DefaultStrategy31 {32 constexpr unsigned long operator()(unsigned long n, auto... other) const33 {34 return (n + ... + other);35 }36 };37 38 constexpr unsigned long Compute(Number<10ul>, auto strategy)39 {40 return strategy(Recursive(10ul));41 }42 43 template<unsigned long N, typename Strategy = DefaultStrategy>44 constexpr unsigned long Cache = Compute(Number<N>{}, Strategy{});45 46 template constexpr unsigned long Cache<10ul>;47}48 49//--- Use.cpp50// expected-no-diagnostics51import Fibonacci.Cache;52 53constexpr bool value = Fibonacci::Cache<10ul> == 55;54 55static_assert(value == true, "");56