don't genrate code in src/

[Outputs of Build Script](https://doc.rust-lang.org/cargo/reference/build-scripts.html#outputs-of-the-build-script) states that only files in $OUT_DIR may be modified

src/atom_table.rs

@@ -21,7 +21,7 @@ pub struct Atom {
 
 const_assert!(mem::size_of::<Atom>() == 8);
 
-include!("./static_atoms.rs");
+include!(concat!(env!("OUT_DIR"), "/static_atoms.rs"));
 
 impl<'a> From<&'a Atom> for Atom {
     #[inline]

src/lib.rs

@@ -21,7 +21,9 @@ mod heap_iter;
 pub mod heap_print;
 mod indexing;
 #[macro_use]
-pub mod instructions;
+pub mod instructions {
+    include!(concat!(env!("OUT_DIR"), "/instructions.rs"));
+}
 mod iterators;
 pub mod machine;
 mod raw_block;
@@ -29,3 +31,5 @@ pub mod read;
 mod targets;
 pub mod types;
 pub mod write;
+
+use instructions::instr;