add support for conjunctive queries.

src/prolog/mod.rs

@@ -1,3 +1,4 @@
+pub mod allocator;
 pub mod and_stack;
 pub mod ast;
 pub mod codegen;
@@ -7,6 +8,7 @@ pub mod heapview;
 pub mod indexing;
 pub mod io;
 pub mod iterators;
+pub mod naive_allocator;
 pub mod prolog_parser;
 pub mod machine;
 pub mod or_stack;