Fix no_function build.

src/optimize.rs

@@ -7,10 +7,13 @@ use crate::engine::{
 };
 use crate::fn_native::FnPtr;
 use crate::module::Module;
-use crate::parser::{map_dynamic_to_expr, Expr, ReturnType, ScriptFnDef, Stmt, AST};
+use crate::parser::{map_dynamic_to_expr, Expr, ScriptFnDef, Stmt, AST};
 use crate::scope::{Entry as ScopeEntry, EntryType as ScopeEntryType, Scope};
 use crate::utils::StaticVec;
 
+#[cfg(not(feature = "no_function"))]
+use crate::parser::ReturnType;
+
 #[cfg(feature = "internals")]
 use crate::parser::CustomExpr;
 
@@ -749,7 +752,8 @@ pub fn optimize_into_ast(
         level
     };
 
-    let lib = if cfg!(not(feature = "no_function")) {
+    #[cfg(not(feature = "no_function"))]
+    let lib = {
         let mut module = Module::new();
 
         if !level.is_none() {
@@ -811,10 +815,11 @@ pub fn optimize_into_ast(
         }
 
         module
-    } else {
-        Default::default()
     };
 
+    #[cfg(feature = "no_function")]
+    let lib = Default::default();
+
     AST::new(
         match level {
             OptimizationLevel::None => statements,