出现编译错误，是依赖版本的问题

darling 版本问题导致编译失败：因为feign-macros的cargo.toml的版本依赖是darling = "0"，而这总会安装最新的前缀的0.开头的版本，最新的版本同作者的程序不兼容，参考：https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html

解决方案：

方案一，临时方案：将依赖改为


[package]
name = "feign-macros"
version = "0.1.6"
edition = "2021"
authors = ["niuhuan <niuhuancn@outlook.com>"]
description = "Rest client of Rust"
license = "MIT"
repository = "https://github.com/niuhuan/feign-rs"

[dependencies] darling = "=0.13.4" proc-macro-error = "1" proc-macro2 = "1" quote = "1" syn = "1"

[lib] proc-macro = true

- 方案二，推荐方案：
在作者电脑中编译通过后，上传cargo.lock文件，使得git跟踪cargo.lock文件。
参考：  https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html

附错误信息如下：

[ERROR rust_analyzer::main_loop] FetchBuildDataError: error[E0432]: unresolved imports `syn::FnArg`, `syn::TraitItemMethod` --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/feign-macros-0.1.6/src/lib.rs:9:30	9	use syn::{parse_macro_input, FnArg, TraitItemMethod};	^^^^^ ^^^^^^^^^^^^^^^ no `TraitItemMethod` in the root
no `FnArg` in the root

note: found an item that was configured out --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/lib.rs:363:5	363	FnArg, ForeignItem, ForeignItemFn, ForeignItemMacro, ForeignItemStatic, ForeignItemType,	^^^^^ = note: the item is gated behind the `full` feature note: found an item that was configured out --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/lib.rs:367:59
367	Signature, TraitItem, TraitItemConst, TraitItemMacro, TraitItemMethod, TraitItemType, UseGlob,
^^^^^^^^^^^^^^^

= note: the item is gated behind the `full` feature

error[E0433]: failed to resolve: could not find TraitItem in syn --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/feign-macros-0.1.6/src/lib.rs:59:18 | 59 | syn::TraitItem::Method(m) => Some(m), | ^^^^^^^^^ could not find TraitItem in syn

error[E0412]: cannot find type `ItemTrait` in crate `syn` --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/feign-macros-0.1.6/src/lib.rs:29:50	29	let input = parse_macro_input!(input as syn::ItemTrait);	^^^^^^^^^ not found in `syn`

note: found an item that was configured out --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/lib.rs:366:29 | 366 | ItemStatic, ItemStruct, ItemTrait, ItemTraitAlias, ItemType, ItemUnion, ItemUse, Receiver, | ^^^^^^^^^ = note: the item is gated behind the full feature

error[E0412]: cannot find type `Pat` in crate `syn` --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/feign-macros-0.1.6/src/lib.rs:372:23	372	Form(&'a Box),	^^^ help: a struct with a similar name exists: `Path`

::: /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/path.rs:4:1	4	/ ast_struct! { 5		/// A path at which a named item is exported (e.g. `std::collections::HashMap`). 6		/// 7		/// *This type is available only if Syn is built with the `"derive"` or `"full"` ...	13		} 14		}		_- similarly named struct `Path` defined here

note: found an item that was configured out --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/lib.rs:417:15 | 417 | FieldPat, Pat, PatBox, PatIdent, PatLit, PatMacro, PatOr, PatPath, PatRange, PatReference, | ^^^ = note: the item is gated behind the full feature

error[E0412]: cannot find type `Pat` in crate `syn` --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/feign-macros-0.1.6/src/lib.rs:373:23	373	Json(&'a Box),	^^^ help: a struct with a similar name exists: `Path`

::: /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/path.rs:4:1	4	/ ast_struct! { 5		/// A path at which a named item is exported (e.g. `std::collections::HashMap`). 6		/// 7		/// *This type is available only if Syn is built with the `"derive"` or `"full"` ...	13		} 14		}		_- similarly named struct `Path` defined here

error[E0308]: mismatched types --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/feign-macros-0.1.6/src/lib.rs:30:56	30	let args: ClientArgs = match ClientArgs::from_list(&args) {	--------------------- ^^^^^ expected `&[NestedMeta]`, found `&Vec<NestedMeta>`
arguments to this function are incorrect

= note: expected reference `&[darling::ast::NestedMeta]`
           found reference `&Vec<syn::NestedMeta>`

note: associated function defined here --> /Users/feihuang.huang/.cargo/registry/src/index.crates.io-6f17d22bba15001f/darling_core-0.20.3/src/from_meta.rs:101:8 | 101 | fn from_list(items: &[NestedMeta]) -> Result { | ^^^^^^^^^

niuhuan / feign-rs

出现编译错误，是依赖版本的问题 #2