diff --git a/source/dyaml/scanner.d b/source/dyaml/scanner.d
index 1048e87..b054ddc 100644
--- a/source/dyaml/scanner.d
+++ b/source/dyaml/scanner.d
@@ -188,29 +188,6 @@ final class Scanner
             reader_ = null;
         }
 
-        /// If error_ is true, throws a ScannerException constructed from errorData_ and
-        /// sets error_ to false.
-        void throwIfError() @safe pure
-        {
-            if(!error_) { return; }
-            error_ = false;
-            throw new ScannerException(errorData_);
-        }
-
-        /// Called by internal nothrow/@nogc methods to set an error to be thrown by
-        /// their callers.
-        ///
-        /// See_Also: dyaml.exception.MarkedYamlException
-        void setError(string context, const Mark contextMark, string problem,
-                      const Mark problemMark) @safe pure nothrow @nogc
-        {
-            assert(error_ == false,
-                   "Setting an error when there already is a not yet thrown error");
-            error_ = true;
-            errorData_ =
-                MarkedYAMLExceptionData(context, contextMark, problem, problemMark);
-        }
-
         /**
          * Check if the next token is one of specified types.
          *
@@ -270,6 +247,34 @@ final class Scanner
         }
 
     private:
+        /// Build an error message in msgBuffer_ and return it as a string.
+        string buildMsg(S ...)(S args) @trusted pure nothrow @nogc
+        {
+            return cast(string)msgBuffer_.printNoGC(args);
+        }
+
+        /// If error_ is true, throws a ScannerException constructed from errorData_ and
+        /// sets error_ to false.
+        void throwIfError() @safe pure
+        {
+            if(!error_) { return; }
+            error_ = false;
+            throw new ScannerException(errorData_);
+        }
+
+        /// Called by internal nothrow/@nogc methods to set an error to be thrown by
+        /// their callers.
+        ///
+        /// See_Also: dyaml.exception.MarkedYamlException
+        void setError(string context, const Mark contextMark, string problem,
+                      const Mark problemMark) @safe pure nothrow @nogc
+        {
+            assert(error_ == false,
+                   "Setting an error when there already is a not yet thrown error");
+            error_     = true;
+            errorData_ = MarkedYAMLExceptionData(context, contextMark, problem, problemMark);
+        }
+
         ///Determine whether or not we need to fetch more tokens before peeking/getting a token.
         bool needMoreTokens() @safe pure
         {