Support trailing slashes in paths

Making the trailing slash a part of the AST will help us implement
path completion.

Change-Id: I64b34634a0affef4046325c29d2767120ece9d37
diff --git a/src/ast_handlers.hpp b/src/ast_handlers.hpp
index 0cb64f1..c596821 100644
--- a/src/ast_handlers.hpp
+++ b/src/ast_handlers.hpp
@@ -476,3 +476,5 @@
             parserContext.m_topLevelModulePresent = false;
     }
 };
+
+struct trailingSlash_class;