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DR: http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1227
This DR has been implemented in Clang as far back as I could check. This patch
simply adds a test and comment to mark it as complete.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D122682
Files:
clang/test/CXX/drs/dr12xx.cpp
clang/www/cxx_dr_status.html
Index: clang/www/cxx_dr_status.html
===================================================================
--- clang/www/cxx_dr_status.html
+++ clang/www/cxx_dr_status.html
@@ -7176,7 +7176,7 @@
<td><a href="https://wg21.link/cwg1227";>1227</a></td>
<td>CD3</td>
<td>Mixing immediate and non-immediate contexts in deduction failure</td>
- <td class="none" align="center">Unknown</td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr id="1228">
<td><a href="https://wg21.link/cwg1228";>1228</a></td>
Index: clang/test/CXX/drs/dr12xx.cpp
===================================================================
--- clang/test/CXX/drs/dr12xx.cpp
+++ clang/test/CXX/drs/dr12xx.cpp
@@ -27,6 +27,21 @@
#endif
}
+#if __cplusplus >= 201103L
+namespace dr1227 { // dr1227: yes
+template <class T> struct A { using X = typename T::X; }; // expected-error
{{type 'int' cannot be used prior to '::' because it has no members}}
+template <class T> typename T::X f(typename A<T>::X);
+template <class T> void f(...) { }
+template <class T> auto g(typename A<T>::X) -> typename T::X; // expected-note
{{in instantiation of template class 'dr1227::A<int>' requested here}}
+template <class T> void g(...) { }
+
+void h() {
+ f<int>(0); // OK, substituting return type causes deduction to fail
+ g<int>(0); // expected-note {{while substituting explicitly-specified
template arguments into function template 'g'}}
+}
+}
+#endif
+
namespace dr1250 { // dr1250: 3.9
struct Incomplete;
Index: clang/www/cxx_dr_status.html
===================================================================
--- clang/www/cxx_dr_status.html
+++ clang/www/cxx_dr_status.html
@@ -7176,7 +7176,7 @@
<td><a href="https://wg21.link/cwg1227";>1227</a></td>
<td>CD3</td>
<td>Mixing immediate and non-immediate contexts in deduction failure</td>
- <td class="none" align="center">Unknown</td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr id="1228">
<td><a href="https://wg21.link/cwg1228";>1228</a></td>
Index: clang/test/CXX/drs/dr12xx.cpp
===================================================================
--- clang/test/CXX/drs/dr12xx.cpp
+++ clang/test/CXX/drs/dr12xx.cpp
@@ -27,6 +27,21 @@
#endif
}
+#if __cplusplus >= 201103L
+namespace dr1227 { // dr1227: yes
+template <class T> struct A { using X = typename T::X; }; // expected-error {{type 'int' cannot be used prior to '::' because it has no members}}
+template <class T> typename T::X f(typename A<T>::X);
+template <class T> void f(...) { }
+template <class T> auto g(typename A<T>::X) -> typename T::X; // expected-note {{in instantiation of template class 'dr1227::A<int>' requested here}}
+template <class T> void g(...) { }
+
+void h() {
+ f<int>(0); // OK, substituting return type causes deduction to fail
+ g<int>(0); // expected-note {{while substituting explicitly-specified template arguments into function template 'g'}}
+}
+}
+#endif
+
namespace dr1250 { // dr1250: 3.9
struct Incomplete;
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