[gcc r12-886] c++: non-static member, decltype, {} [PR100205]

[gcc r12-886] c++: non-static member, decltype, {} [PR100205]

[Jason Merrill]

https://gcc.gnu.org/g:8c114759b8c9c9e2ec90b82d92a24b5a71647017

commit r12-886-g8c114759b8c9c9e2ec90b82d92a24b5a71647017
Author: Jason Merrill <jason@redhat.com>
Date:   Tue May 18 12:18:56 2021 -0400

    c++: non-static member, decltype, {} [PR100205]
    
    This test was fixed by my second patch for PR93314, which distinguishes
    between constant-expression and potentially-constant-evaluated contexts in a
    way that my first patch did not.
    
            PR c++/100205
            PR c++/99314
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/cpp0x/decltype-nonstatic1.C: New test.

Diff:
---
 gcc/testsuite/g++.dg/cpp0x/decltype-nonstatic1.C | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gcc/testsuite/g++.dg/cpp0x/decltype-nonstatic1.C b/gcc/testsuite/g++.dg/cpp0x/decltype-nonstatic1.C
new file mode 100644
index 00000000000..bc488ff388b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/decltype-nonstatic1.C
@@ -0,0 +1,16 @@
+// PR c++/100205
+// { dg-do compile { target c++11 } }
+
+struct coordinate_matrix {
+  using index_t = unsigned;
+  struct convert_to_matrix_coordinate {
+    index_t column_id;
+  };
+  index_t column_id;
+
+  // does not work
+  using value_type2 = decltype(convert_to_matrix_coordinate{column_id});
+
+  // does work
+  using value_type5 = decltype(column_id);
+};