Index: clang/lib/Sema/SemaCast.cpp
===================================================================
--- clang/lib/Sema/SemaCast.cpp
+++ clang/lib/Sema/SemaCast.cpp
@@ -3328,6 +3328,9 @@
   if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
     ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
 
+  // -Wcast-qual
+  DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
+
   return Op.complete(CXXFunctionalCastExpr::Create(
       Context, Op.ResultType, Op.ValueKind, CastTypeInfo, Op.Kind,
       Op.SrcExpr.get(), &Op.BasePath, CurFPFeatureOverrides(), LPLoc, RPLoc));
Index: clang/test/SemaCXX/warn-cast-qual.cpp
===================================================================
--- clang/test/SemaCXX/warn-cast-qual.cpp
+++ clang/test/SemaCXX/warn-cast-qual.cpp
@@ -138,3 +138,29 @@
     *(int *)(&S.b) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
   }
 }
+
+void qux_0() {
+  const auto i = 42;
+  using T = int*;
+  auto p = T(&i); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
+
+  const auto i2 = 42;
+  using T2 = const int*;
+  auto p2 = T2(&i2);
+
+  volatile auto i3 = 42;
+  using T3= int*;
+  auto p3 = T3(&i3); // expected-warning {{cast from 'volatile int *' to 'int *' drops volatile qualifier}}
+
+  volatile auto i4 = 42;
+  using T4 = volatile int*;
+  auto p4 = T4(&i4);
+
+  const volatile auto i5 = 42;
+  using T5= int*;
+  auto p5 = T5(&i5);  // expected-warning {{cast from 'const volatile int *' to 'int *' drops const and volatile qualifiers}}
+
+  const volatile auto i6 = 42;
+  using T6= const volatile int*;
+  auto p6 = T6(&i6);
+}