src/inline.d

@@ -2109,7 +2109,20 @@ void expandInline(FuncDeclaration fd, FuncDeclaration parent, Expression eret,
             if (vfrom.type.ty == Tdelegate ||
                 vfrom.type.ty == Tpointer && vfrom.type.nextOf().ty == Tfunction)
             {
-                again = true;
+                if (arg.op == TOKvar)
+                {
+                    VarExp ve = cast(VarExp)arg;
+                    if (ve.var.isFuncDeclaration())
+                        again = true;
+                }
+                else if (arg.op == TOKsymoff)
+                {
+                    SymOffExp se = cast(SymOffExp)arg;
+                    if (se.var.isFuncDeclaration())
+                        again = true;
+                }
+                else if (arg.op == TOKfunction || arg.op == TOKdelegate)
+                    again = true;
             }
         }
     }

test/runnable/inline.d

@@ -892,6 +892,29 @@ void test15207()
     auto c = new C15207();
 }
 
+/**********************************/
+// 15253
+
+struct MessageType15253
+{
+    MessageType15253[] messageTypes;
+
+    const void toString1(scope void delegate(const(char)[]) sink)
+    {
+        messageTypes[0].toString1(sink);
+    }
+}
+
+struct ProtoPackage15253
+{
+    MessageType15253[] messageTypes;
+
+    const void toString1(scope void delegate(const(char)[]) sink)
+    {
+        messageTypes[0].toString1(sink);
+    }
+}
+
 /**********************************/
 
 int main()