mlua_derive: Drop itertools dependency

Plus minor codestyle changes

Author: khvzak

mlua_derive/Cargo.toml

@@ -13,10 +13,9 @@ license = "MIT"
 proc-macro = true
 
 [features]
-macros = ["itertools"]
+macros = []
 
 [dependencies]
 quote = "1.0"
 proc-macro2 = { version = "1.0", features = ["span-locations"] }
 syn = { version = "2.0", features = ["full"] }
-itertools = { version = "0.14", optional = true }

mlua_derive/src/chunk/mod.rs

@@ -91,10 +91,8 @@ impl Chunk {
             prev_end = Some(t.end());
         }
 
-        Ok(Self {
-            source: source.trim_end().to_string(),
-            caps,
-        })
+        let source = source.trim_end().to_string();
+        Ok(Self { source, caps })
     }
 
     pub(crate) fn captures(&self) -> &[Capture] {

mlua_derive/src/chunk/token.rs

@@ -137,8 +137,8 @@ pub(crate) struct Tokens(pub(crate) Vec<Token>);
 impl Tokens {
     pub(crate) fn retokenize(tt: TokenStream) -> Result<Tokens, TokenStream2> {
         let mut flat = Vec::new();
-        for tree in tt.into_iter() {
-            flat.extend(Tokens::try_from(tree)?.0);
+        for tree in tt {
+            flat.extend(Tokens::try_from(tree)?);
         }
 
         let mut tokens = Vec::new();
@@ -189,8 +189,8 @@ impl TryFrom<TokenTree> for Tokens {
                 let (b, e) = (b.into(), e.into());
 
                 let mut result = vec![Token::new_delim(b, tt.clone(), true)?];
-                for inner in g.stream().into_iter() {
-                    result.extend(Tokens::try_from(inner)?.0);
+                for inner in g.stream() {
+                    result.extend(Tokens::try_from(inner)?);
                 }
                 result.push(Token::new_delim(e, tt, false)?);
                 result