1 // RUN: rm -rf %t
2 // RUN: %clang_cc1 -x c++ -I %S/Inputs/redecl-templates %s -verify -std=c++14
3 // RUN: %clang_cc1 -x c++ -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs/redecl-templates %s -verify -std=c++14
4 // expected-no-diagnostics
5 
6 template<int N> struct A {};
7 template<int N> using X = A<N>;
8 
9 template<int N> constexpr void f() {}
10 template<int N> constexpr void g() { f<N>(); }
11 
12 template<int N> extern int v;
13 template<int N> int &w = v<N>;
14 
15 #include "a.h"
16 
17 // Be careful not to mention A here, that'll import the decls from "a.h".
18 int g(X<1> *);
19 X<1> *p = 0;
20 
21 // This will implicitly instantiate A<1> if we haven't imported the explicit
22 // specialization declaration from "a.h".
23 int k = g(p);
24 // Likewise for f and v.
25 void h() { g<1>(); }
26 int &x = w<1>;
27 
28 // This is OK: we declared the explicit specialization before we triggered
29 // instantiation of this specialization.
30 template<> struct A<1> {};
31 template<> constexpr void f<1>() {}
32 template<> int v<1>;
33