Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -16819,8 +16819,9 @@
       if (InnerCond && isa<ConceptSpecializationExpr>(InnerCond)) {
         // Drill down into concept specialization expressions to see why they
         // weren't satisfied.
-        Diag(StaticAssertLoc, diag::err_static_assert_failed)
-          << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
+        Diag(AssertExpr->getSourceRange().getBegin(),
+             diag::err_static_assert_failed)
+            << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
         ConstraintSatisfaction Satisfaction;
         if (!CheckConstraintSatisfaction(InnerCond, Satisfaction))
           DiagnoseUnsatisfiedConstraint(Satisfaction);
@@ -16831,7 +16832,8 @@
           << Msg.str() << InnerCond->getSourceRange();
         DiagnoseStaticAssertDetails(InnerCond);
       } else {
-        Diag(StaticAssertLoc, diag::err_static_assert_failed)
+        Diag(AssertExpr->getSourceRange().getBegin(),
+             diag::err_static_assert_failed)
             << !AssertMessage << Msg.str() << AssertExpr->getSourceRange();
         PrintContextStack();
       }