add function module

compiler/src/constraints/mod.rs

@@ -1,8 +1,5 @@
 //! Module containing methods to enforce constraints in an Leo program
 
-pub mod function;
-pub use self::function::*;
-
 pub mod generate_constraints;
 pub use self::generate_constraints::*;
 

compiler/src/function/function.rs

@@ -1,5 +1,4 @@
-//! Methods to enforce functions with arguments in
-//! a resolved Leo program.
+//! Methods to enforce functions with arguments in a resolved Leo program.
 
 use crate::{
     address::Address,

compiler/src/function/mod.rs

@@ -0,0 +1,2 @@
+pub mod function;
+pub use self::function::*;

compiler/src/lib.rs

@@ -15,6 +15,9 @@ pub mod errors;
 pub mod expression;
 pub use self::expression::*;
 
+pub mod function;
+pub use self::function::*;
+
 pub mod imports;
 pub use self::imports::*;