Merge pull request #1608 from BD103/deps-features

Use `dep:` and optional dependency feature `?` syntax

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [stable, beta, 1.60.0, 1.56.0]
+        rust: [stable, beta, 1.60.0]
         include:
           - rust: nightly
             components: rustc-dev
@@ -52,7 +52,6 @@ jobs:
             os: windows
     env:
       target: ${{matrix.target && format('--target={0}', matrix.target)}}
-      manifestpath: ${{matrix.rust == '1.56.0' && '--manifest-path tests/crate/Cargo.toml' || ''}}
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v4
@@ -61,21 +60,21 @@ jobs:
           toolchain: ${{matrix.rust}}
           targets: ${{matrix.target}}
           components: ${{matrix.components}}
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features
-      - run: cargo check ${{env.manifestpath}} ${{env.target}}
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --features full
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --features 'fold visit visit-mut'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --features 'full fold visit visit-mut'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features derive
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'derive parsing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'derive printing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'proc-macro parsing printing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features full
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'full parsing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'full printing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'full parsing printing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'fold visit visit-mut parsing printing'
-      - run: cargo check ${{env.manifestpath}} ${{env.target}} --no-default-features --features 'full fold visit visit-mut parsing printing'
+      - run: cargo check ${{env.target}} --no-default-features
+      - run: cargo check ${{env.target}}
+      - run: cargo check ${{env.target}} --features full
+      - run: cargo check ${{env.target}} --features 'fold visit visit-mut'
+      - run: cargo check ${{env.target}} --features 'full fold visit visit-mut'
+      - run: cargo check ${{env.target}} --no-default-features --features derive
+      - run: cargo check ${{env.target}} --no-default-features --features 'derive parsing'
+      - run: cargo check ${{env.target}} --no-default-features --features 'derive printing'
+      - run: cargo check ${{env.target}} --no-default-features --features 'proc-macro parsing printing'
+      - run: cargo check ${{env.target}} --no-default-features --features full
+      - run: cargo check ${{env.target}} --no-default-features --features 'full parsing'
+      - run: cargo check ${{env.target}} --no-default-features --features 'full printing'
+      - run: cargo check ${{env.target}} --no-default-features --features 'full parsing printing'
+      - run: cargo check ${{env.target}} --no-default-features --features 'fold visit visit-mut parsing printing'
+      - run: cargo check ${{env.target}} --no-default-features --features 'full fold visit visit-mut parsing printing'
       - if: matrix.components == 'rustc-dev'
         run: cargo check --benches --all-features --release
 

Cargo.toml

@@ -18,20 +18,20 @@ include = [
 keywords = ["macros", "syn"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/syn"
-rust-version = "1.56"
+rust-version = "1.60"
 
 [features]
 default = ["derive", "parsing", "printing", "clone-impls", "proc-macro"]
 derive = []
 full = []
 parsing = []
-printing = ["quote"]
+printing = ["dep:quote"]
 visit = []
 visit-mut = []
 fold = []
 clone-impls = []
 extra-traits = []
-proc-macro = ["proc-macro2/proc-macro", "quote/proc-macro"]
+proc-macro = ["proc-macro2/proc-macro", "quote?/proc-macro"]
 test = ["syn-test-suite/all-features"]
 
 [dependencies]

README.md

@@ -46,7 +46,7 @@ contains some APIs that may be useful more generally.
 [`syn::DeriveInput`]: https://docs.rs/syn/2.0/syn/struct.DeriveInput.html
 [parser functions]: https://docs.rs/syn/2.0/syn/parse/index.html
 
-*Version requirement: Syn supports rustc 1.56 and up.*
+*Version requirement: Syn supports rustc 1.60 and up.*
 
 [*Release notes*](https://github.com/dtolnay/syn/releases)