[PATCH] PR88395 Fix Nullptr when compiling with -fconcepts

[Nicholas Krause]

This fixes bug id,88395 by checking if the second tree reqs
is correctly not a null pointer before calling the function,
tsubst_requirement_body. Otherwise we will get a nullptr
if compiling with -fconcepts for concepts enabled.

Signed-off-by: Nicholas Krause <xerofo...@gmail.com>
---
 gcc/cp/constraint.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 9884eb0db50..a4bf1632021 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -1888,9 +1888,11 @@ tsubst_requires_expr (tree t, tree args,
     }
 
   tree reqs = TREE_OPERAND (t, 1);
+  if (reqs) {
   reqs = tsubst_requirement_body (reqs, args, complain, in_decl);
   if (reqs == error_mark_node)
     return error_mark_node;
+  }
 
   return finish_requires_expr (parms, reqs);
 }
-- 
2.17.1