[gcc r10-9916] libstdc++: Adjust expected errors in tests when compiled as C++20

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:1bb1b6a5e7010217aa3cdde147b9a6ab0160060f

commit r10-9916-g1bb1b6a5e7010217aa3cdde147b9a6ab0160060f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon May 10 15:10:45 2021 +0100

    libstdc++: Adjust expected errors in tests when compiled as C++20
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/scoped_allocator/69293_neg.cc: Add dg-error
            for additional errors in C++20.
            * testsuite/20_util/uses_allocator/69293_neg.cc: Likewise.
            * testsuite/20_util/uses_allocator/cons_neg.cc: Likewise.
    
    (cherry picked from commit 23972128c83e62011b583f06b32c8501c096b7d8)

Diff:
---
 libstdc++-v3/testsuite/20_util/scoped_allocator/69293_neg.cc | 1 +
 libstdc++-v3/testsuite/20_util/uses_allocator/69293_neg.cc   | 3 ++-
 libstdc++-v3/testsuite/20_util/uses_allocator/cons_neg.cc    | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/scoped_allocator/69293_neg.cc b/libstdc++-v3/testsuite/20_util/scoped_allocator/69293_neg.cc
index 6f3cd0a2521..975862b3365 100644
--- a/libstdc++-v3/testsuite/20_util/scoped_allocator/69293_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/scoped_allocator/69293_neg.cc
@@ -47,6 +47,7 @@ test01()
   auto p = sa.allocate(1);
   sa.construct(p);  // this is required to be ill-formed
   // { dg-error "failed: .* uses_allocator is true" "" { target *-*-* } 0 }
+  // { dg-error "too many initializers for 'X'" "" { target c++2a } 0 }
 }
 
 // Needed because of PR c++/92193
diff --git a/libstdc++-v3/testsuite/20_util/uses_allocator/69293_neg.cc b/libstdc++-v3/testsuite/20_util/uses_allocator/69293_neg.cc
index 423ecc4d90e..6626e5a9713 100644
--- a/libstdc++-v3/testsuite/20_util/uses_allocator/69293_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/uses_allocator/69293_neg.cc
@@ -45,5 +45,6 @@ test01()
   alloc_type a;
   std::tuple<X> t(std::allocator_arg, a); // this is required to be ill-formed
   // { dg-error "failed: .* uses_allocator is true" "" { target *-*-* } 0 }
-  // { dg-error "no matching function for call" "" { target c++2a } 0 }
+  // { dg-error "too many initializers for 'X'" "" { target c++2a } 0 }
+  // { dg-prune-output "in 'constexpr' expansion" }
 }
diff --git a/libstdc++-v3/testsuite/20_util/uses_allocator/cons_neg.cc b/libstdc++-v3/testsuite/20_util/uses_allocator/cons_neg.cc
index c3ff05aa72a..966e579cc99 100644
--- a/libstdc++-v3/testsuite/20_util/uses_allocator/cons_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/uses_allocator/cons_neg.cc
@@ -45,3 +45,4 @@ void test01()
 }
 // { dg-error "failed: .* uses_allocator is true" "" { target *-*-* } 0 }
 // { dg-error "no matching function for call" "" { target c++2a } 0 }
+// { dg-prune-output "in 'constexpr' expansion" }