Update syn, quote, and proc-macro2 to post-1.0 versions

This crate will currently stop compiling once PR rust-lang/rust#76130
(a bugfix to the Rust compiler) is merged, due to the fact than old
version of `syn` is in use. Newer versions of `syn` can parse the
`TokenStream` passed by newer versions of rustc, allowing this crate to
compile under both older and newer versions of rustc.

jsonrpc-types/internals/Cargo.toml

@@ -6,9 +6,9 @@ license = "Apache-2.0"
 edition = "2018"
 
 [dependencies]
-syn = "0.14"
-quote = "0.6"
-proc-macro2 = "0.4"
+syn = "1.0.41"
+quote = "1"
+proc-macro2 = "1"
 
 [lib]
 proc-macro = true

jsonrpc-types/internals/src/lib.rs

@@ -19,17 +19,19 @@ extern crate syn;
 #[macro_use]
 extern crate quote;
 
+use syn::parse::{Parse, ParseStream, Result};
+
 struct TypeWithAttrs {
     typ: syn::Type,
     attrs: Vec<syn::Attribute>,
 }
 
-impl syn::synom::Synom for TypeWithAttrs {
-    named!(parse -> Self, do_parse!(
-        attrs: many0!(syn::Attribute::parse_outer) >>
-        typ: syn!(syn::Type) >>
-        (TypeWithAttrs{ typ, attrs })
-    ));
+impl Parse for TypeWithAttrs {
+    fn parse(input: ParseStream) -> Result<Self> {
+        let attrs = input.call(syn::Attribute::parse_outer)?;
+        let typ: syn::Type = input.parse()?;
+        Ok(TypeWithAttrs { typ, attrs })
+    }
 }
 
 struct ParamsType {
@@ -41,15 +43,22 @@ struct ParamsType {
     resp: syn::Ident,
 }
 
-impl syn::synom::Synom for ParamsType {
-    named!(parse -> Self, do_parse!(
-        name: syn!(syn::Ident) >>
-        punct!(:) >>
-        types: brackets!(call!(syn::punctuated::Punctuated::parse_separated)) >>
-        punct!(,) >>
-        resp: syn!(syn::Ident) >>
-        (ParamsType { name, types, resp })
-    ));
+impl Parse for ParamsType {
+    fn parse(input: ParseStream) -> Result<Self> {
+        let name: syn::Ident = input.parse()?;
+        let _colon: Token![:] = input.parse()?;
+
+        let inner;
+        let bracket = bracketed!(inner in input);
+        let types = syn::punctuated::Punctuated::parse_terminated(&inner)?;
+        let _comma: Token![,] = input.parse()?;
+        let resp: syn::Ident = input.parse()?;
+        Ok(ParamsType {
+            name,
+            types: (bracket, types),
+            resp
+        })
+    }
 }
 
 // Get JSON-RPC name from params name.