[committed] libstdc++: Fix typo in std::stacktrace::max_size [PR115063]

[Jonathan Wakely]

Tested x86_64-linux. Pushed to trunk, gcc14 and gcc-13.

-- >8 --

libstdc++-v3/ChangeLog:

        PR libstdc++/115063
        * include/std/stacktrace (basic_stacktrace::max_size): Fix typo
        in reference to _M_alloc member.
        * testsuite/19_diagnostics/stacktrace/stacktrace.cc: Check
        max_size() compiles.
---
 libstdc++-v3/include/std/stacktrace                    |  2 +-
 .../testsuite/19_diagnostics/stacktrace/stacktrace.cc  | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/stacktrace 
b/libstdc++-v3/include/std/stacktrace
index 92a69a53d98..d217d63af3b 100644
--- a/libstdc++-v3/include/std/stacktrace
+++ b/libstdc++-v3/include/std/stacktrace
@@ -430,7 +430,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       [[nodiscard]]
       size_type
       max_size() const noexcept
-      { return _Impl::_S_max_size(_M_impl._M_alloc); }
+      { return _Impl::_S_max_size(_M_alloc); }
 
       [[nodiscard]]
       const_reference
diff --git a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc 
b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc
index 070c4157471..a49cddfef26 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/stacktrace/stacktrace.cc
@@ -206,10 +206,20 @@ test_pr105031()
   s = auto(s);
 }
 
+void
+test_pr115063()
+{
+  // PR libstdc++/115063
+  // compilation error: std::basic_stracktrace::max_size()
+  std::stacktrace s;
+  VERIFY( s.max_size() != 0 );
+}
+
 int main()
 {
   test_cons();
   test_assign();
   test_swap();
   test_pr105031();
+  test_pr115063();
 }
-- 
2.44.0