chore(deps): Update syn to 2 (#214)

* chore(deps): Update syn to 2

* Remove non-existant feature flag from tests

Author: jsdw

derive/Cargo.toml

@@ -18,7 +18,7 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0"
-syn = { version = "1.0", features = ["derive", "visit", "visit-mut", "extra-traits"] }
+syn = { version = "2.0", features = ["derive", "visit", "visit-mut", "extra-traits"] }
 proc-macro2 = "1.0"
 proc-macro-crate = "3"
 

derive/src/attr.rs

@@ -48,13 +48,12 @@ impl Attributes {
         let mut replace_segments = Vec::new();
 
         let attributes_parser = |input: &ParseBuffer| {
-            let attrs: Punctuated<ScaleInfoAttr, Token![,]> =
-                input.parse_terminated(ScaleInfoAttr::parse)?;
+            let attrs = input.parse_terminated(ScaleInfoAttr::parse, Token![,])?;
             Ok(attrs)
         };
 
         for attr in &item.attrs {
-            if !attr.path.is_ident(SCALE_INFO) {
+            if !attr.path().is_ident(SCALE_INFO) {
                 continue;
             }
             let scale_info_attrs = attr.parse_args_with(attributes_parser)?;
@@ -177,7 +176,7 @@ impl Parse for BoundsAttr {
         input.parse::<keywords::bounds>()?;
         let content;
         syn::parenthesized!(content in input);
-        let predicates = content.parse_terminated(syn::WherePredicate::parse)?;
+        let predicates = content.parse_terminated(syn::WherePredicate::parse, Token![,])?;
         Ok(Self { predicates })
     }
 }
@@ -215,7 +214,7 @@ impl Parse for SkipTypeParamsAttr {
         input.parse::<keywords::skip_type_params>()?;
         let content;
         syn::parenthesized!(content in input);
-        let type_params = content.parse_terminated(syn::TypeParam::parse)?;
+        let type_params = content.parse_terminated(syn::TypeParam::parse, Token![,])?;
         Ok(Self { type_params })
     }
 }

derive/src/lib.rs

@@ -261,22 +261,24 @@ impl TypeInfoImpl {
         let docs = attrs
             .iter()
             .filter_map(|attr| {
-                if let Ok(syn::Meta::NameValue(meta)) = attr.parse_meta() {
-                    if meta.path.get_ident().map_or(false, |ident| ident == "doc") {
-                        if let syn::Lit::Str(lit) = &meta.lit {
-                            let lit_value = lit.value();
-                            let stripped = lit_value.strip_prefix(' ').unwrap_or(&lit_value);
-                            let lit: syn::Lit = parse_quote!(#stripped);
-                            Some(lit)
-                        } else {
-                            None
-                        }
-                    } else {
-                        None
-                    }
-                } else {
-                    None
+                if !attr.path().is_ident("doc") {
+                    return None;
                 }
+                let syn::Meta::NameValue(nv) = &attr.meta else {
+                    return None;
+                };
+                let syn::Expr::Lit(syn::ExprLit {
+                    lit: syn::Lit::Str(s),
+                    ..
+                }) = &nv.value
+                else {
+                    return None;
+                };
+
+                let lit_value = s.value();
+                let stripped = lit_value.strip_prefix(' ').unwrap_or(&lit_value);
+                let lit: syn::Lit = parse_quote!(#stripped);
+                Some(lit)
             })
             .collect::<Vec<_>>();
 

derive/src/utils.rs

@@ -18,7 +18,9 @@
 
 use proc_macro2::TokenStream;
 use quote::quote;
-use syn::{parse::Parse, spanned::Spanned, AttrStyle, Attribute, Lit, Meta, NestedMeta, Variant};
+use syn::{
+    parse::Parse, spanned::Spanned, AttrStyle, Attribute, Expr, ExprLit, Lit, Meta, Variant,
+};
 
 /// Look for a `#[codec(index = $int)]` attribute on a variant. If no attribute
 /// is found, fall back to the discriminant or just the variant index.
@@ -43,9 +45,13 @@ pub fn maybe_index(variant: &Variant) -> Option<u8> {
         .filter(|attr| attr.style == AttrStyle::Outer);
 
     codec_meta_item(outer_attrs, |meta| {
-        if let NestedMeta::Meta(Meta::NameValue(ref nv)) = meta {
+        if let Meta::NameValue(ref nv) = meta {
             if nv.path.is_ident("index") {
-                if let Lit::Int(ref v) = nv.lit {
+                if let Expr::Lit(ExprLit {
+                    lit: Lit::Int(ref v),
+                    ..
+                }) = nv.value
+                {
                     let byte = v
                         .base10_parse::<u8>()
                         .expect("Internal error. `#[codec(index = …)]` attribute syntax must be checked in `parity-scale-codec`. This is a bug.");
@@ -65,7 +71,7 @@ pub fn is_compact(field: &syn::Field) -> bool {
         .iter()
         .filter(|attr| attr.style == AttrStyle::Outer);
     codec_meta_item(outer_attrs, |meta| {
-        if let NestedMeta::Meta(Meta::Path(ref path)) = meta {
+        if let Meta::Path(ref path) = meta {
             if path.is_ident("compact") {
                 return Some(());
             }
@@ -79,7 +85,7 @@ pub fn is_compact(field: &syn::Field) -> bool {
 /// Look for a `#[codec(skip)]` in the given attributes.
 pub fn should_skip(attrs: &[Attribute]) -> bool {
     codec_meta_item(attrs.iter(), |meta| {
-        if let NestedMeta::Meta(Meta::Path(ref path)) = meta {
+        if let Meta::Path(ref path) = meta {
             if path.is_ident("skip") {
                 return Some(path.span());
             }
@@ -106,7 +112,7 @@ where
     M: Parse,
 {
     itr.find_map(|attr| {
-        attr.path
+        attr.path()
             .is_ident(kind)
             .then(|| pred(attr.parse_args().ok()?))
             .flatten()

test_suite/tests/codec.rs

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#![no_std]
 #![allow(unused)]
-#![cfg_attr(not(feature = "std"), no_std)]
 #![allow(dead_code)]
 
 use info::{self as scale_info};

test_suite/tests/derive.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#![cfg_attr(not(feature = "std"), no_std)]
+#![no_std]
 
 use core::ops::{Range, RangeInclusive};
 

test_suite/tests/json.rs

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#![no_std]
 #![allow(unused)]
-#![cfg_attr(not(feature = "std"), no_std)]
 #![allow(dead_code)]
 
 use info::{self as scale_info};