Merge pull request #8 from GnomedDev/reduce-msrv

Reduce MSRV to 1.53

.github/workflows/CI.yml

@@ -9,12 +9,12 @@ on:
 jobs:
   # == CHECK == #
   check:
-    name: "Check beta stable and MSRV=1.57.0"
+    name: "Check beta stable and MSRV=1.53.0"
     runs-on: ubuntu-latest
     strategy:
       matrix:
         rust-toolchains:
-          - 1.57.0
+          - 1.53.0
           - stable
           - beta
         cargo-locked: ["--locked", ""]
@@ -52,7 +52,7 @@ jobs:
           - macos-latest
           - windows-latest
         rust-toolchains:
-          - 1.57.0
+          - 1.53.0
           - stable
     steps:
       - name: Install Rust toolchain
@@ -67,6 +67,10 @@ jobs:
 
       - name: Cargo test
         uses: actions-rs/cargo@v1
+        env:
+          RUSTDOCFLAGS: '-Zcrate-attr=feature(macro_attributes_in_derive_output)'
+          RUSTFLAGS: '-Zcrate-attr=feature(macro_attributes_in_derive_output)'
+          RUSTC_BOOTSTRAP: '1'
         with:
           command: test
 

.github/workflows/future-proof.yml

@@ -21,7 +21,7 @@ jobs:
           - macos-latest
           - windows-latest
         rust-toolchains:
-          - 1.57.0
+          - 1.53.0
           - stable
           - beta
           - nightly
@@ -43,12 +43,16 @@ jobs:
 
       - name: Cargo test
         uses: actions-rs/cargo@v1
+        env:
+          RUSTDOCFLAGS: '-Zcrate-attr=feature(macro_attributes_in_derive_output)'
+          RUSTFLAGS: '-Zcrate-attr=feature(macro_attributes_in_derive_output)'
+          RUSTC_BOOTSTRAP: '1'
         with:
           command: test
           args: ${{ matrix.cargo-locked }}
 
       # - name: Cargo test (embed `README.md` + UI)
-      #   if: matrix.rust-toolchains != '1.57.0'
+      #   if: matrix.rust-toolchains != '1.53.0'
       #   uses: actions-rs/cargo@v1
       #   with:
       #     command: test-ui

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "macro_rules_attribute"
-version = "0.1.1"  # Keep in sync
+version = "0.1.2"  # Keep in sync
 authors = ["Daniel Henry-Mantilla <daniel.henry.mantilla@gmail.com>"]
-edition = "2021"
+edition = "2018"
 
 documentation = "https://docs.rs/macro_rules_attribute"
 homepage = "https://crates.io/crates/macro_rules_attribute"
@@ -19,7 +19,7 @@ readme = "README.md"
 paste.version = "1.0.7"
 
 [dependencies.macro_rules_attribute-proc_macro]
-version = "0.1.1"  # Keep in sync
+version = "0.1.2"  # Keep in sync
 path = "src/proc_macro"
 
 [features]

README.md

@@ -23,7 +23,7 @@ https://github.com/danielhenrymantilla/macro_rules_attribute-rs)
 https://crates.io/crates/macro_rules_attribute)
 [![Documentation](https://docs.rs/macro_rules_attribute/badge.svg)](
 https://docs.rs/macro_rules_attribute)
-[![MSRV](https://img.shields.io/badge/MSRV-1.57.0-white)](
+[![MSRV](https://img.shields.io/badge/MSRV-1.53.0-white)](
 https://gist.github.com/danielhenrymantilla/8e5b721b3929084562f8f65668920c33)
 [![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](
 https://github.com/rust-secure-code/safety-dance/)

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = '1.57.0'
+channel = '1.53.0'
 # Templated by `cargo-generate` using https://github.com/danielhenrymantilla/proc-macro-template

src/lib.rs

@@ -5,7 +5,9 @@
 [`macro_rules_attribute`]: macro_rules_attribute
 [`macro_rules_derive`]: macro_rules_derive
 */
-#![doc = include_str!("../README.md")]
+#![cfg_attr(feature = "better-docs",
+    cfg_attr(all(), doc = include_str!("../README.md"))
+)]
 #![cfg_attr(feature = "better-docs",
     feature(doc_auto_cfg),
 )]
@@ -489,7 +491,7 @@ macro_rules! ඞ_with_dollar {( $($rules:tt)* ) => (
 )}
 
 /// Like <code>#\[[macro_rules_derive]\]</code>, but for allowing to be
-/// used to shadow [the "built-in" `#[derive]` attribute][1].
+/// used to shadow [the "built-in" `#[derive]` attribute][1] (on Rust ≥ 1.57.0).
 ///
 /// [1]: https://doc.rust-lang.org/stable/core/prelude/v1/macro.derive.html
 ///

src/proc_macro/Cargo.toml

@@ -4,9 +4,9 @@ path = "mod.rs"
 
 [package]
 name = "macro_rules_attribute-proc_macro"
-version = "0.1.1"  # Keep in sync
+version = "0.1.2"  # Keep in sync
 authors = ["Daniel Henry-Mantilla <daniel.henry.mantilla@gmail.com>"]
-edition = "2021"
+edition = "2018"
 
 description = "Use declarative macros as proc_macro attributes or derives"
 license = "MIT"

src/proc_macro/mod.rs

@@ -4,6 +4,7 @@
 use {
     ::core::{
         ops::Not as _,
+        iter::FromIterator as _,
     },
     ::proc_macro::{*,
         TokenTree as TT,