diff --git a/stdx/d/parser.d b/stdx/d/parser.d
index 160ba61..c1dc7bd 100644
--- a/stdx/d/parser.d
+++ b/stdx/d/parser.d
@@ -6047,6 +6047,7 @@ protected:
     bool isDeclaration()
     {
         mixin(traceEnterAndExit!(__FUNCTION__));
+        if (!moreTokens()) return false;
         with (TokenType) switch (current.type)
         {
         case final_:
@@ -6131,6 +6132,7 @@ protected:
 
     bool isStatement()
     {
+        if (!moreTokens()) return false;
         auto b = setBookmark();
         scope (exit) goToBookmark(b);
         return parseStatement() !is null;
@@ -6138,6 +6140,7 @@ protected:
 
     bool isExpression()
     {
+        if (!moreTokens()) return false;
         auto b = setBookmark();
         scope (exit) goToBookmark(b);
         return parseExpression() !is null;
@@ -6145,6 +6148,7 @@ protected:
 
     bool isType()
     {
+        if (!moreTokens()) return false;
         auto b = setBookmark();
         scope (exit) goToBookmark(b);
         if (parseType() is null) return false;