libstdc++: Fix macro checked by test

The macro being tested here is wrong, but just happens to have the same
value as the one supposed to be tests.

libstdc++-v3/ChangeLog:

	* testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc:
	Check correct feature test macro.

diff --git a/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc b/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
index 28f8ae8..2705098 100644 (file)
--- a/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
@@ -22,7 +22,7 @@
 
 #ifndef __cpp_lib_constexpr_string_view
 # error "Feature test macro for constexpr copy is missing in <string_view>"
-#elif __cpp_lib_constexpr_iterator < 201811L
+#elif __cpp_lib_constexpr_string_view < 201811L
 # error "Feature test macro for constexpr copy has wrong value in <string_view>"
 #endif