Clippy fix in eval

Except there's some issues with parser macros preventing it for
schala-language

schala-lang/language/Cargo.toml

@@ -2,8 +2,7 @@
 name = "schala-lang"
 version = "0.1.0"
 authors = ["greg <greg.shuflin@protonmail.com>"]
-edition = "2018"
-resolver = "2"
+edition = "2021"
 
 [dependencies]
 itertools = "0.10"

schala-lang/language/src/eval/mod.rs

@@ -186,7 +186,7 @@ impl<'a> State<'a> {
     for stmt in stmts {
       ret = self.statement(stmt)?;
     }
-    Ok(ret.unwrap_or(Node::Expr(Expr::unit())))
+    Ok(ret.unwrap_or_else(|| Node::Expr(Expr::unit())))
   }
 
   fn expression(&mut self, node: Node) -> EvalResult<Node> {

schala-lang/language/src/lib.rs

@@ -1,6 +1,6 @@
 #![feature(trace_macros)]
 //#![feature(unrestricted_attribute_tokens)]
-#![feature(box_patterns, box_syntax)]
+#![feature(box_patterns, box_syntax, iter_intersperse)]
 
 //! `schala-lang` is where the Schala programming language is actually implemented.
 //! It defines the `Schala` type, which contains the state for a Schala REPL, and implements

schala-lang/language/src/parsing/mod.rs

@@ -308,13 +308,13 @@ macro_rules! expect {
 }
 
 macro_rules! delimited {
-  ($self:expr, $start:pat, $parse_fn:ident, $( $delim:pat )|+, $end:pat, nonstrict) => {
-    delimited!($self, $start, $parse_fn, $( $delim )|*, $end, false)
+  ($self:expr, $start:pat, $parse_fn:ident, $delim:pat, $end:pat, nonstrict) => {
+    delimited!($self, $start, $parse_fn, $delim, $end, false)
   };
-  ($self:expr, $start:pat, $parse_fn:ident, $( $delim:pat )|+, $end:pat) => {
-    delimited!($self, $start, $parse_fn, $( $delim )|*, $end, true)
+  ($self:expr, $start:pat, $parse_fn:ident, $delim:pat, $end:pat) => {
+    delimited!($self, $start, $parse_fn, $delim, $end, true)
   };
-  ($self:expr, $start:pat, $parse_fn:ident, $( $delim:pat )|+, $end:pat, $strictness:expr) => {
+  ($self:expr, $start:pat, $parse_fn:ident, $delim:pat, $end:pat, $strictness:expr) => {
     {
       expect!($self, $start);
       let mut acc = vec![];
@@ -326,13 +326,13 @@ macro_rules! delimited {
         }
         if !$strictness {
           match peek.get_kind() {
-            $( $delim )|* => { $self.token_handler.next(); continue },
+            $delim => { $self.token_handler.next(); continue },
             _ => ()
           }
         }
         acc.push($self.$parse_fn()?);
         match $self.token_handler.peek().get_kind() {
-          $( $delim )|* => { $self.token_handler.next(); continue },
+          $delim => { $self.token_handler.next(); continue },
           _ if $strictness => break,
           _ => continue,
         };

schala-repl/Cargo.toml

@@ -2,8 +2,7 @@
 name = "schala-repl"
 version = "0.1.0"
 authors = ["greg <greg.shuflin@protonmail.com>"]
-edition = "2018"
-resolver = "2"
+edition = "2021"
 
 [dependencies]
 llvm-sys = "70.0.2"

schala-repl/src/lib.rs

@@ -1,4 +1,4 @@
-#![feature(box_patterns, box_syntax, proc_macro_hygiene, decl_macro)]
+#![feature(box_patterns, box_syntax, proc_macro_hygiene, decl_macro, iter_intersperse)]
 #![feature(plugin)]
 
 #[macro_use]