flatten the instruction dispatch loop

src/lib.rs

@@ -1,3 +1,5 @@
+#![recursion_limit = "4112"]
+
 #[macro_use]
 extern crate static_assertions;
 
@@ -11,7 +13,6 @@ pub mod arena;
 pub mod parser;
 mod allocator;
 mod arithmetic;
-mod clause_types;
 pub mod codegen;
 mod debray_allocator;
 mod fixtures;
@@ -19,7 +20,8 @@ mod forms;
 mod heap_iter;
 pub mod heap_print;
 mod indexing;
-mod instructions;
+#[macro_use]
+pub mod instructions;
 mod iterators;
 pub mod machine;
 mod raw_block;