[gcc r13-8670] c++: problematic assert in reference_binding [PR113141]

[gcc r13-8670] c++: problematic assert in reference_binding [PR113141]

[Patrick Palka]

https://gcc.gnu.org/g:c70abea054fe0021b7b2c2e07996afaadc17a07b

commit r13-8670-gc70abea054fe0021b7b2c2e07996afaadc17a07b
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed May 1 18:16:08 2024 -0400

    c++: problematic assert in reference_binding [PR113141]
    
    r14-9946 / r14-9947 fixed this PR properly for GCC 14.
    
    For GCC 13, let's just remove the problematic assert.
    
            PR c++/113141
    
    gcc/cp/ChangeLog:
    
            * call.cc (reference_binding): Remove badness criteria sanity
            check in the recursive case.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/conversion/ref12.C: New test.
            * g++.dg/cpp0x/initlist-ref1.C: new test.

Diff:
---
 gcc/cp/call.cc                             |  1 -
 gcc/testsuite/g++.dg/conversion/ref12.C    | 13 +++++++++++++
 gcc/testsuite/g++.dg/cpp0x/initlist-ref1.C | 16 ++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/call.cc b/gcc/cp/call.cc
index b10bdc62d38..70c7f6178b8 100644
--- a/gcc/cp/call.cc
+++ b/gcc/cp/call.cc
@@ -2017,7 +2017,6 @@ reference_binding (tree rto, tree rfrom, tree expr, bool c_cast_p, int flags,
 	    if (!new_second)
 	      return NULL;
 	    conv = merge_conversion_sequences (t, new_second);
-	    gcc_assert (maybe_valid_p || conv->bad_p);
 	    return conv;
 	  }
     }
diff --git a/gcc/testsuite/g++.dg/conversion/ref12.C b/gcc/testsuite/g++.dg/conversion/ref12.C
new file mode 100644
index 00000000000..633b7e48e47
--- /dev/null
+++ b/gcc/testsuite/g++.dg/conversion/ref12.C
@@ -0,0 +1,13 @@
+// PR c++/113141
+
+struct Matrix { };
+
+struct TPoint3 { operator const Matrix(); };
+
+void f(Matrix&);
+
+int main() {
+  TPoint3 X;
+  Matrix& m = (Matrix &)X;
+  f((Matrix &)X);
+}
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist-ref1.C b/gcc/testsuite/g++.dg/cpp0x/initlist-ref1.C
new file mode 100644
index 00000000000..f893f12dafa
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist-ref1.C
@@ -0,0 +1,16 @@
+// PR c++/113141
+// { dg-do compile { target c++11 } }
+
+struct ConvToRef {
+  operator int&();
+};
+
+struct A { int& r; };
+
+void f(A);
+
+int main() {
+  ConvToRef c;
+  A a{{c}};
+  f({{c}});
+}