On 1/11/26 6:52 AM, David Malcolm wrote:
Thanks Patrick and Jason.  Here's an updated version, incorporating
your feedback.

Changed in v2:

* use range-based for in flatten_candidates as per Patrick's suggestion
* use "tree" rather than "auto" in print_candidates as per Patrick's
suggestion
* fix broken DejaGnu directive
* pass location_t of error to print_candidates, so that we can use it
for the candidate count message, rather than using UNKNOWN_LOCATION and
having "cc1plus: " appear in the message.  Use the location of the error
for the call to print_candidates.  Since various calls to
print_candidates appear after a call to "error()" which implicitly uses
input_location, the patch explicitly uses input_location for these calls.

Successfully bootstrapped & regrtested on x86_64-pc-linux-gnu.
OK for trunk?

OK.

Thanks
Dave



Blurb for v1:

In r15-6116-gd3dd24acd74605 I updated print_z_candidates to print a
count of the number of candidates, and to show the number of each
candidate in the list if there is more than one.

The following patch updates print_candidates to work in a similar
way, showing counts, numbering, and using nesting.

Consider this test case for which we print 2 candidates:

class foo
{
public:
   void test (int i, int j, void *ptr, int k);
   void test (int i, int j, int k);
};

// Wrong "const"-ness of a param, for one of the overloads (param 3).
void foo::test (int i, int j, const void *ptr, int k)
{
}

The output before the patch is:

test.cc:9:6: error: no declaration matches ‘void foo::test(int, int, const 
void*, int)’
     9 | void foo::test (int i, int j, const void *ptr, int k)
       |      ^~~
test.cc:5:8: note: candidates are: ‘void foo::test(int, int, int)’
     5 |   void test (int i, int j, int k);
       |        ^~~~
test.cc:4:8: note:                 ‘void foo::test(int, int, void*, int)’
     4 |   void test (int i, int j, void *ptr, int k);
       |        ^~~~
test.cc:1:7: note: ‘class foo’ defined here
     1 | class foo
       |       ^~~

With the patch, the output looks like:

test.cc:9:6: error: no declaration matches ‘void foo::test(int, int, const 
void*, int)’
     9 | void foo::test (int i, int j, const void *ptr, int k)
       |      ^~~
   • there are 2 candidates
     • candidate 1: ‘void foo::test(int, int, int)’
       test.cc:5:8:
           5 |   void test (int i, int j, int k);
             |        ^~~~
     • candidate 2: ‘void foo::test(int, int, void*, int)’
       test.cc:4:8:
           4 |   void test (int i, int j, void *ptr, int k);
             |        ^~~~
test.cc:1:7: note: ‘class foo’ defined here
     1 | class foo
       |       ^~~

which I believe is much more readable.

I dabbled with removing the "there is 1 candidate" line for the case of
a single candidate, but I think I prefer it to be present.

FWIW I've been experimenting with followups that
* show more nested information about the problems (e.g. the "void *"
vs "const void *" mismatch) - having the candidates be nested is a
useful step towards that
* potentially look at the "edit distance" of the type signatures to find
close matches, and perhaps reordering/highlighting them (e.g. in the
above candidate 2 is arguably a closer match than candidate 1, due to
the "const" snafu) - gathering an auto_vec might help with that.

gcc/cp/ChangeLog:
        * call.cc (print_z_candidates): Move inform_n call into a new
        inform_num_candidates function.
        * class.cc (check_methods): Pass location to call to
        print_candidates.
        (resolve_address_of_overloaded_function): Likewise.
        * cp-tree.h (print_candidates): Add location_t param.
        (inform_num_candidates): New decl.
        * decl.cc (make_typename_type): Pass location to call to
        print_candidates.
        (reshape_init_class): Likewise.
        (lookup_and_check_tag): Likewise.
        * decl2.cc (check_classfn): Likewise.
        * error.cc (qualified_name_lookup_error): Likewise.
        * init.cc (build_new_1): Likewise.
        * name-lookup.cc (lookup_using_decl): Likewise.
        (set_decl_namespace): Likewise.
        (push_namespace): Likewise.
        * parser.cc (cp_parser_nested_name_specifier_opt): Likewise.
        (cp_parser_lookup_name): Likewise.
        * pt.cc  (print_candidates_1): Drop, converting the looping part
        into...
        (flatten_candidates): ...this new function.
        (inform_num_candidates): New function.
        (print_candidates): Use flatten_candidates to build an auto_vec
        of candidates, and use this to print them here, rather than in
        print_candidates_1.  Eliminate the dynamic allocation of spaces
        for a prefix in favor of printing "candidate %i" when there is
        more than one candidate.  Add "error_loc" param and pass it to
        inform_num_candidates to show a heading, and add nesting levels
        for it and for the candidate notes.
        (determine_specialization): Pass location to calls to
        print_candidates.
        * search.cc (lookup_member): Likewise.
        * semantics.cc (finish_id_expression_1): Likewise.

gcc/testsuite/ChangeLog:
        * g++.dg/cpp0x/inline-ns2.C: Make dg-message directives non-empty.
        * g++.dg/cpp23/explicit-obj-lambda11.C: Prune the extra note.
        * g++.dg/diagnostic/bad-fndef-1.C: New test.
        * g++.dg/lookup/decl1.C: Give the dg-message directives different
        messages.
        * g++.dg/lookup/using17.C: Update expected output.
        * g++.dg/parse/non-dependent2.C: Likewise.
        * g++.old-deja/g++.other/lineno2.C: Give the dg-message directives
        different messages.
        * g++.old-deja/g++.pt/t37.C: Likewise.
---
  gcc/cp/call.cc                                |  5 +-
  gcc/cp/class.cc                               |  6 +-
  gcc/cp/cp-tree.h                              |  3 +-
  gcc/cp/decl.cc                                |  6 +-
  gcc/cp/decl2.cc                               |  2 +-
  gcc/cp/error.cc                               |  2 +-
  gcc/cp/init.cc                                |  2 +-
  gcc/cp/name-lookup.cc                         |  7 +-
  gcc/cp/parser.cc                              |  5 +-
  gcc/cp/pt.cc                                  | 73 +++++++++++--------
  gcc/cp/search.cc                              |  2 +-
  gcc/cp/semantics.cc                           |  2 +-
  gcc/testsuite/g++.dg/cpp0x/inline-ns2.C       | 18 ++---
  .../g++.dg/cpp23/explicit-obj-lambda11.C      |  2 +-
  gcc/testsuite/g++.dg/diagnostic/bad-fndef-1.C | 15 ++++
  gcc/testsuite/g++.dg/lookup/decl1.C           |  8 +-
  gcc/testsuite/g++.dg/lookup/using17.C         |  4 +-
  gcc/testsuite/g++.dg/parse/non-dependent2.C   |  2 +-
  .../g++.old-deja/g++.other/lineno2.C          |  8 +-
  gcc/testsuite/g++.old-deja/g++.pt/t37.C       | 10 +--
  20 files changed, 104 insertions(+), 78 deletions(-)
  create mode 100644 gcc/testsuite/g++.dg/diagnostic/bad-fndef-1.C

diff --git a/gcc/cp/call.cc b/gcc/cp/call.cc
index 608fb9b69d0..fa8281f01ba 100644
--- a/gcc/cp/call.cc
+++ b/gcc/cp/call.cc
@@ -4261,9 +4261,8 @@ print_z_candidates (location_t loc, struct z_candidate 
*candidates,
        ++num_candidates;
      }
- inform_n (loc,
-           num_candidates, "there is %i candidate", "there are %i candidates",
-           num_candidates);
+  inform_num_candidates (loc, num_candidates);
+
    auto_diagnostic_nesting_level sentinel2;
int candidate_idx = 0;
diff --git a/gcc/cp/class.cc b/gcc/cp/class.cc
index a6a7c88c3dd..f6f052a9d68 100644
--- a/gcc/cp/class.cc
+++ b/gcc/cp/class.cc
@@ -5138,7 +5138,7 @@ check_methods (tree t)
            error_at (location_of (t), "no viable destructor for %qT", t);
          else
            error_at (location_of (t), "destructor for %qT is ambiguous", t);
-         print_candidates (dtor);
+         print_candidates (location_of (t), dtor);
/* Arbitrarily prune the overload set to a single function for
             sake of error recovery.  */
@@ -9116,7 +9116,7 @@ resolve_address_of_overloaded_function (tree target_type,
          error ("no matches converting function %qD to type %q#T",
                 OVL_NAME (overload), target_type);
- print_candidates (overload);
+         print_candidates (input_location, overload);
        }
        return error_mark_node;
      }
@@ -9148,7 +9148,7 @@ resolve_address_of_overloaded_function (tree target_type,
              for (match = matches; match; match = TREE_CHAIN (match))
                TREE_VALUE (match) = TREE_PURPOSE (match);
- print_candidates (matches);
+             print_candidates (input_location, matches);
            }
return error_mark_node;
diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index b8470fc256c..01843f7fc92 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -7941,7 +7941,8 @@ extern tree maybe_process_partial_specialization (tree);
  extern tree most_specialized_instantiation    (tree);
  extern tree most_specialized_partial_spec       (tree, tsubst_flags_t, bool = 
false);
  extern tree most_constrained_function         (tree);
-extern void print_candidates                   (tree);
+extern void inform_num_candidates              (location_t, int);
+extern void print_candidates                   (location_t, tree);
  extern void instantiate_pending_templates     (int);
  extern tree tsubst_default_argument           (tree, int, tree, tree,
                                                 tsubst_flags_t);
diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index a2a14c4c008..7d35a8fbfbc 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -5066,7 +5066,7 @@ make_typename_type (tree context, tree name, enum 
tag_types tag_type,
        {
          auto_diagnostic_group d;
          error ("lookup of %qT in %qT is ambiguous", name, context);
-         print_candidates (t);
+         print_candidates (input_location, t);
        }
        return error_mark_node;
      }
@@ -7775,7 +7775,7 @@ reshape_init_class (tree type, reshape_iter *d, bool 
first_initializer_p,
                      auto_diagnostic_group g;
                      error ("request for member %qD is ambiguous",
                             d->cur->index);
-                     print_candidates (field);
+                     print_candidates (input_location, field);
                    }
                  else
                    error ("%qT has no non-static data member named %qD", type,
@@ -18105,7 +18105,7 @@ lookup_and_check_tag (enum tag_types tag_code, tree 
name,
      {
        auto_diagnostic_group d;
        error ("reference to %qD is ambiguous", name);
-      print_candidates (decl);
+      print_candidates (input_location, decl);
        return error_mark_node;
      }
diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index e807eab1b8a..5eb2ed42732 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -917,7 +917,7 @@ check_classfn (tree ctype, tree function, tree 
template_parms)
          error_at (DECL_SOURCE_LOCATION (function),
                    "no declaration matches %q#D", function);
          if (fns)
-           print_candidates (fns);
+           print_candidates (DECL_SOURCE_LOCATION (function), fns);
          else if (DECL_CONV_FN_P (function))
            inform (DECL_SOURCE_LOCATION (function),
                    "no conversion operators declared");
diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index e23ea9aa48c..c51725555a9 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -4988,7 +4988,7 @@ qualified_name_lookup_error (tree scope, tree name,
          auto_diagnostic_group d;
          error_at (location, "reference to %<%T::%D%> is ambiguous",
                    scope, name);
-         print_candidates (decl);
+         print_candidates (location, decl);
        }
        else
        {
diff --git a/gcc/cp/init.cc b/gcc/cp/init.cc
index 79672e98de4..01e3d007a49 100644
--- a/gcc/cp/init.cc
+++ b/gcc/cp/init.cc
@@ -3430,7 +3430,7 @@ build_new_1 (vec<tree, va_gc> **placement, tree type, 
tree nelts,
            {
              auto_diagnostic_group d;
              error ("request for member %qD is ambiguous", fnname);
-             print_candidates (fns);
+             print_candidates (input_location, fns);
            }
          return error_mark_node;
        }
diff --git a/gcc/cp/name-lookup.cc b/gcc/cp/name-lookup.cc
index ff738f15d93..ce565bde4b3 100644
--- a/gcc/cp/name-lookup.cc
+++ b/gcc/cp/name-lookup.cc
@@ -6336,7 +6336,8 @@ lookup_using_decl (tree scope, name_lookup &lookup)
      {
        auto_diagnostic_group d;
        error ("reference to %qD is ambiguous", lookup.name);
-      print_candidates (TREE_CODE (lookup.value) == TREE_LIST
+      print_candidates (input_location,
+                       TREE_CODE (lookup.value) == TREE_LIST
                        ? lookup.value : lookup.type);
        return NULL_TREE;
      }
@@ -6469,7 +6470,7 @@ set_decl_namespace (tree decl, tree scope, bool friendp)
        auto_diagnostic_group d;
        DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
        error ("reference to %qD is ambiguous", decl);
-      print_candidates (old);
+      print_candidates (input_location, old);
        return;
      }
@@ -9365,7 +9366,7 @@ push_namespace (tree name, bool make_inline)
        if (TREE_CHAIN (lookup.value))
          {
            error ("%<namespace %E%> is ambiguous", name);
-           print_candidates (lookup.value);
+           print_candidates (input_location, lookup.value);
          }
        }
      else if (TREE_CODE (lookup.value) == NAMESPACE_DECL)
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index e48868eedbd..91e08a73b75 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -7607,7 +7607,8 @@ cp_parser_nested_name_specifier_opt (cp_parser *parser,
                              error_at (token->location,
                                        "reference to %qD is ambiguous",
                                        token->u.value);
-                             print_candidates (ambiguous_decls);
+                             print_candidates (token->location,
+                                               ambiguous_decls);
                            }
                          decl = error_mark_node;
                        }
@@ -34347,7 +34348,7 @@ cp_parser_lookup_name (cp_parser *parser, tree name,
          auto_diagnostic_group d;
          error_at (name_location, "reference to %qD is ambiguous",
                    name);
-         print_candidates (decl);
+         print_candidates (name_location, decl);
        }
        return error_mark_node;
      }
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 759418c344e..9bc15527ea4 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -2038,50 +2038,59 @@ explicit_class_specialization_p (tree type)
    return !uses_template_parms (CLASSTYPE_TI_ARGS (type));
  }
-/* Print the list of functions at FNS, going through all the overloads
-   for each element of the list.  Alternatively, FNS cannot be a
-   TREE_LIST, in which case it will be printed together with all the
-   overloads.
-
-   MORE and *STR should respectively be FALSE and NULL when the function
-   is called from the outside.  They are used internally on recursive
-   calls.  print_candidates manages the two parameters and leaves NULL
-   in *STR when it ends.  */
+/* Populate OUT with the overload set FNS, going through all the
+   overloads for each element of the list.  Alternatively, FNS can be a
+   TREE_LIST, in which case it will be added together with all the
+   overloads.  */
static void
-print_candidates_1 (tree fns, char **str, bool more = false)
+flatten_candidates (tree fns, auto_vec<tree> &out)
  {
    if (TREE_CODE (fns) == TREE_LIST)
      for (; fns; fns = TREE_CHAIN (fns))
-      print_candidates_1 (TREE_VALUE (fns), str, more || TREE_CHAIN (fns));
+      flatten_candidates (TREE_VALUE (fns), out);
    else
-    for (lkp_iterator iter (fns); iter;)
-      {
-       tree cand = *iter;
-       ++iter;
+    for (tree cand : lkp_range (fns))
+      out.safe_push (cand);
+}
- const char *pfx = *str;
-       if (!pfx)
-         {
-           if (more || iter)
-             pfx = _("candidates are:");
-           else
-             pfx = _("candidate is:");
-           *str = get_spaces (pfx);
-         }
-       inform (DECL_SOURCE_LOCATION (cand), "%s %#qD", pfx, cand);
-      }
+/* Print a note announcing a list of candidates.  */
+
+void
+inform_num_candidates (location_t loc, int num_candidates)
+{
+  inform_n (loc,
+           num_candidates, "there is %i candidate", "there are %i candidates",
+           num_candidates);
  }
/* Print the list of candidate FNS in an error message. FNS can also
     be a TREE_LIST of non-functions in the case of an ambiguous lookup.  */
void
-print_candidates (tree fns)
+print_candidates (location_t error_loc, tree fns)
  {
-  char *str = NULL;
-  print_candidates_1 (fns, &str);
-  free (str);
+  auto_vec<tree> candidates;
+  flatten_candidates (fns, candidates);
+
+  auto_diagnostic_nesting_level sentinel;
+
+  inform_num_candidates (error_loc, candidates.length ());
+
+  auto_diagnostic_nesting_level sentinel2;
+
+  if (candidates.length () == 1)
+    {
+      tree cand = candidates[0];
+      inform (DECL_SOURCE_LOCATION (cand), "candidate is: %#qD", cand);
+    }
+  else
+    {
+      int idx = 0;
+      for (tree cand : candidates)
+       inform (DECL_SOURCE_LOCATION (cand), "candidate %i: %#qD",
+               ++idx, cand);
+    }
  }
/* Get a (possibly) constrained template declaration for the
@@ -2505,7 +2514,7 @@ determine_specialization (tree template_id,
                "saw %d %<template<>%>, need %d for "
                "specializing a member function template",
                header_count, template_count + 1);
-      print_candidates (orig_fns);
+      print_candidates (DECL_SOURCE_LOCATION (decl), orig_fns);
        return error_mark_node;
      }
    else if ((templates && TREE_CHAIN (templates))
@@ -2516,7 +2525,7 @@ determine_specialization (tree template_id,
        error ("ambiguous template specialization %qD for %q+D",
             template_id, decl);
        candidates = chainon (candidates, templates);
-      print_candidates (candidates);
+      print_candidates (input_location, candidates);
        return error_mark_node;
      }
diff --git a/gcc/cp/search.cc b/gcc/cp/search.cc
index 0ded4780729..db7c2d7702a 100644
--- a/gcc/cp/search.cc
+++ b/gcc/cp/search.cc
@@ -1243,7 +1243,7 @@ lookup_member (tree xbasetype, tree name, int protect, 
bool want_type,
            {
              auto_diagnostic_group d;
              error ("request for member %qD is ambiguous", name);
-             print_candidates (lfi.ambiguous);
+             print_candidates (input_location, lfi.ambiguous);
            }
          return error_mark_node;
        }
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index 3e9da8d2439..78d717cade3 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -4934,7 +4934,7 @@ finish_id_expression_1 (tree id_expression,
          auto_diagnostic_group d;
          error ("request for member %qD is ambiguous in "
                 "multiple inheritance lattice", id_expression);
-         print_candidates (decl);
+         print_candidates (input_location, decl);
          return error_mark_node;
        }
diff --git a/gcc/testsuite/g++.dg/cpp0x/inline-ns2.C b/gcc/testsuite/g++.dg/cpp0x/inline-ns2.C
index 6ad9d65a6fb..1dc8efeb329 100644
--- a/gcc/testsuite/g++.dg/cpp0x/inline-ns2.C
+++ b/gcc/testsuite/g++.dg/cpp0x/inline-ns2.C
@@ -2,17 +2,17 @@
namespace Q {
    inline namespace V1 {
-    extern int i;              // { dg-message "" }
-    extern int j;              // { dg-message "" }
-    void f();                  // { dg-message "" }
-    void g();                  // { dg-message "" }
+    extern int i;              // { dg-message "candidate" }
+    extern int j;              // { dg-message "candidate" }
+    void f();                  // { dg-message "candidate" }
+    void g();                  // { dg-message "candidate" }
    }
    inline namespace V2 {
-    extern int j;              // { dg-message "" }
-    void g();                  // { dg-message "" }
+    extern int j;              // { dg-message "candidate" }
+    void g();                  // { dg-message "candidate" }
    }
-  extern int i;                        // { dg-message "" }
-  void f();                    // { dg-message "" }
+  extern int i;                        // { dg-message "candidate" }
+  void f();                    // { dg-message "candidate" }
    void h();
  }
  namespace R {
@@ -22,4 +22,4 @@ int Q::i = 1;                 // { dg-error "ambiguous" }
  int Q::j = 1;                 // { dg-error "ambiguous" }
  void Q::f() { }                       // { dg-error "ambiguous" }
  void Q::g() { }                       // { dg-error "ambiguous" }
-void R::h() { }                        // { dg-error "" }
+void R::h() { }                        // { dg-error "should have been declared 
inside 'R'" }
diff --git a/gcc/testsuite/g++.dg/cpp23/explicit-obj-lambda11.C 
b/gcc/testsuite/g++.dg/cpp23/explicit-obj-lambda11.C
index 7957ad3e194..731caf16eff 100644
--- a/gcc/testsuite/g++.dg/cpp23/explicit-obj-lambda11.C
+++ b/gcc/testsuite/g++.dg/cpp23/explicit-obj-lambda11.C
@@ -40,8 +40,8 @@ void test2()
int (*fp0)(decltype(f)&) = &decltype(f)::operator();
    int (*fp1)(int&) = &decltype(f)::operator(); // { dg-error {no matches 
converting function} }
+  // { dg-note "there is 1 candidate" "" { target *-*-* } .-1 }
  }
// { dg-error "a lambda with captures may not have an explicit object parameter of an unrelated type" {depends on PR112874} { xfail *-*-* } t2_f }
  // { dg-note "candidate is" "" { target *-*-* } t2_f }
-
diff --git a/gcc/testsuite/g++.dg/diagnostic/bad-fndef-1.C 
b/gcc/testsuite/g++.dg/diagnostic/bad-fndef-1.C
new file mode 100644
index 00000000000..1156072b11f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/diagnostic/bad-fndef-1.C
@@ -0,0 +1,15 @@
+class foo // { dg-message "'class foo' defined here" }
+{
+public:
+  void test (int i, int j, void *ptr, int k); // { dg-line close_decl }
+  void test (int i, int j, int k);            // { dg-line other_decl }
+};
+
+// Wrong "const"-ness of a param, for one of the overloads (param 3).
+void foo::test (int i, int j, const void *ptr, int k) // { dg-line defn }
+{
+}
+
+// { dg-error "6: no declaration matches" "error" { target *-*-* } defn }
+// { dg-message "8: candidate 1: " "candidate 1" { target *-*-* } other_decl }
+// { dg-message "8: candidate 2: " "candidate 2" { target *-*-* } close_decl }
diff --git a/gcc/testsuite/g++.dg/lookup/decl1.C 
b/gcc/testsuite/g++.dg/lookup/decl1.C
index 205ffcff1d7..38319ba923d 100644
--- a/gcc/testsuite/g++.dg/lookup/decl1.C
+++ b/gcc/testsuite/g++.dg/lookup/decl1.C
@@ -20,10 +20,10 @@ C2<X>::operator C1<Y>()
  }
struct A { // { dg-message "defined here" }
-  operator int ();                     // { dg-message "operator" }
-  operator float ();                   // { dg-message "operator" }
-  operator float () const;             // { dg-message "operator" }
-  template <typename T> operator T * (); // { dg-message "operator" }
+  operator int ();                     // { dg-message "operator int" }
+  operator float ();                   // { dg-message "operator float" }
+  operator float () const;             // { dg-message "operator float" }
+  template <typename T> operator T * (); // { dg-message "operator T" }
  };
A::operator short () { // { dg-error "no declaration matches" }
diff --git a/gcc/testsuite/g++.dg/lookup/using17.C 
b/gcc/testsuite/g++.dg/lookup/using17.C
index 55875fe9af9..374dcfa8f25 100644
--- a/gcc/testsuite/g++.dg/lookup/using17.C
+++ b/gcc/testsuite/g++.dg/lookup/using17.C
@@ -3,11 +3,11 @@
  // { dg-do compile }
namespace M {
-  struct S {}; // { dg-message "candidates are: .struct M::S." "candidate 1" }
+  struct S {}; // { dg-message "candidate 1: 'struct M::S'" }
  }
int S;
-struct S {}; // { dg-message ".struct S." "candidate 2" }
+struct S {}; // { dg-message "candidate 2: 'struct S'" }
using namespace M; diff --git a/gcc/testsuite/g++.dg/parse/non-dependent2.C b/gcc/testsuite/g++.dg/parse/non-dependent2.C
index c22497044e9..eb83390206c 100644
--- a/gcc/testsuite/g++.dg/parse/non-dependent2.C
+++ b/gcc/testsuite/g++.dg/parse/non-dependent2.C
@@ -15,7 +15,7 @@ struct Foo {
  struct Baz
  {
    int j;
-  int k; // { dg-message "candidates" }
+  int k; // { dg-message "candidate" }
}; diff --git a/gcc/testsuite/g++.old-deja/g++.other/lineno2.C b/gcc/testsuite/g++.old-deja/g++.other/lineno2.C
index d6aca8b9cfd..6434f9ac45c 100644
--- a/gcc/testsuite/g++.old-deja/g++.other/lineno2.C
+++ b/gcc/testsuite/g++.old-deja/g++.other/lineno2.C
@@ -2,14 +2,14 @@
  // Submitted by Nathan Sidwell <[email protected]>
  // Bug: g++ wasn't listing candidates for a failed conversion.
-void f(int, double); // { dg-message "" } candidate
-void f(double, int);           // { dg-message "" } candidate
-void f(int);                   // { dg-message "" } candidate
+void f(int, double);           // { dg-message "candidate" }
+void f(double, int);           // { dg-message "candidate" }
+void f(int);                   // { dg-message "candidate" }
int
  main ()
  {
    void (*ptr)(int, int);
- ptr = &f; // { dg-error "" } no match
+  ptr = &f;                        // { dg-error "no matches" }
  }
diff --git a/gcc/testsuite/g++.old-deja/g++.pt/t37.C 
b/gcc/testsuite/g++.old-deja/g++.pt/t37.C
index dbf1f4403b3..ffef5e58a43 100644
--- a/gcc/testsuite/g++.old-deja/g++.pt/t37.C
+++ b/gcc/testsuite/g++.old-deja/g++.pt/t37.C
@@ -1,14 +1,14 @@
  // { dg-do compile  }
-class A { // { dg-message "A::A" } synthesized copy ctor
-  // { dg-message "defined here" "note" { target *-*-* } .-1 }
+class A { // { dg-message "A::A\\\(const A&\\\)" } synthesized copy ctor
+  // { dg-message "'class A' defined here" "note" { target *-*-* } .-1 }
  public:
-  A(int);                      // { dg-message "A::A" }
-  A(float);                    // { dg-message "A::A" }
+  A(int);                      // { dg-message "A::A\\\(int\\\)" }
+  A(float);                    // { dg-message "A::A\\\(float\\\)" }
    ~A();
  };
-A::A() { // { dg-error "" }
+A::A() {               // { dg-error "no declaration matches" }
  }
A::A(int) {

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