.github/workflows/ci.yml

@@ -24,13 +24,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [1.31.0, stable, beta]
+        rust: [1.67.0, stable, beta]
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{matrix.rust}}
+          components: rust-src
       - run: cargo test
       - run: cargo test --no-default-features
       - run: cargo test --features span-locations
@@ -50,10 +51,15 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
       - name: Enable type layout randomization
-        run: echo RUSTFLAGS=${RUSTFLAGS}\ -Zrandomize-layout >> $GITHUB_ENV
+        run: echo RUSTFLAGS=${RUSTFLAGS}\ -Zrandomize-layout\ --cfg=randomize_layout >> $GITHUB_ENV
+      - run: cargo check
+        env:
+          RUSTFLAGS: --cfg procmacro2_nightly_testing ${{env.RUSTFLAGS}}
       - run: cargo test
       - run: cargo test --no-default-features
       - run: cargo test --no-default-features --test features -- --ignored make_sure_no_proc_macro # run the ignored test to make sure the `proc-macro` feature is disabled
@@ -70,8 +76,64 @@ jobs:
       - name: RUSTFLAGS='-Z allow-features=' cargo test
         run: cargo test
         env:
-          RUSTFLAGS: -Z allow-features= ${{env.RUSTFLAGS}}
-      - run: cargo update -Z minimal-versions && cargo build
+          RUSTFLAGS: -Z allow-features= --cfg procmacro2_backtrace ${{env.RUSTFLAGS}}
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: Cargo.lock
+          path: Cargo.lock
+        continue-on-error: true
+
+  layout:
+    name: Layout
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
+      - run: cargo test --test test_size
+      - run: cargo test --test test_size --features span-locations
+      - run: cargo test --test test_size --no-default-features
+      - run: cargo test --test test_size --no-default-features --features span-locations
+
+  msrv:
+    name: Rust 1.56.0
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@1.56.0
+        with:
+          components: rust-src
+      - run: cargo check
+      - run: cargo check --no-default-features
+      - run: cargo check --features span-locations
+      - name: RUSTFLAGS='--cfg procmacro2_semver_exempt' cargo check
+        run: cargo check
+        env:
+          RUSTFLAGS: --cfg procmacro2_semver_exempt ${{env.RUSTFLAGS}}
+      - name: RUSTFLAGS='--cfg procmacro2_semver_exempt' cargo check --no-default-features
+        run: cargo check --no-default-features
+        env:
+          RUSTFLAGS: --cfg procmacro2_semver_exempt ${{env.RUSTFLAGS}}
+
+  minimal:
+    name: Minimal versions
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+      - run: cargo generate-lockfile -Z minimal-versions
+      - run: cargo check --locked
 
   webassembly:
     name: WebAssembly
@@ -80,10 +142,13 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
         with:
           target: wasm32-unknown-unknown
+          components: rust-src
+      - name: Ignore WebAssembly linker warning
+        run: echo RUSTFLAGS=${RUSTFLAGS}\ -Alinker_messages >> $GITHUB_ENV
       - run: cargo test --target wasm32-unknown-unknown --no-run
 
   fuzz:
@@ -93,19 +158,46 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
       - uses: dtolnay/install@cargo-fuzz
       - run: cargo fuzz check
+      - run: cargo check --no-default-features --features afl
+        working-directory: fuzz
+      - uses: dtolnay/install@honggfuzz
+      - run: sudo apt-get update  # https://github.com/actions/runner-images/issues/8953
+      - run: sudo apt-get install binutils-dev libunwind-dev
+      - run: cargo hfuzz build --no-default-features --features honggfuzz
+        working-directory: fuzz
+
+  doc:
+    name: Documentation
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    env:
+      RUSTDOCFLAGS: -Dwarnings
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
+      - uses: dtolnay/install@cargo-docs-rs
+      - run: cargo docs-rs
 
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     if: github.event_name != 'pull_request'
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@clippy
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: clippy, rust-src
       - run: cargo clippy --tests -- -Dclippy::all -Dclippy::pedantic
       - run: cargo clippy --tests --all-features -- -Dclippy::all -Dclippy::pedantic
 
@@ -116,8 +208,11 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@miri
+        with:
+          toolchain: nightly-2025-05-16  # https://github.com/rust-lang/miri/issues/4323
+      - run: cargo miri setup
       - run: cargo miri test
         env:
           MIRIFLAGS: -Zmiri-strict-provenance
@@ -128,7 +223,8 @@ jobs:
     if: github.event_name != 'pull_request'
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
       - uses: dtolnay/install@cargo-outdated
       - run: cargo outdated --workspace --exit-code 1
       - run: cargo outdated --manifest-path fuzz/Cargo.toml --exit-code 1

.gitignore

@@ -1,3 +1,2 @@
-/target
-**/*.rs.bk
-Cargo.lock
+/target/
+/Cargo.lock

Cargo.toml

@@ -1,21 +1,28 @@
 [package]
 name = "proc-macro2"
-version = "1.0.52" # remember to update html_root_url
+version = "1.0.95"
 authors = ["David Tolnay <dtolnay@gmail.com>", "Alex Crichton <alex@alexcrichton.com>"]
 autobenches = false
 categories = ["development-tools::procedural-macro-helpers"]
 description = "A substitute implementation of the compiler's `proc_macro` API to decouple token-based libraries from the procedural macro use case."
 documentation = "https://docs.rs/proc-macro2"
-edition = "2018"
+edition = "2021"
 keywords = ["macros", "syn"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/proc-macro2"
-rust-version = "1.31"
+rust-version = "1.56"
 
 [package.metadata.docs.rs]
-rustc-args = ["--cfg", "procmacro2_semver_exempt"]
-rustdoc-args = ["--cfg", "procmacro2_semver_exempt", "--cfg", "doc_cfg"]
+rustc-args = ["--cfg=procmacro2_semver_exempt"]
 targets = ["x86_64-unknown-linux-gnu"]
+rustdoc-args = [
+    "--cfg=procmacro2_semver_exempt",
+    "--generate-link-to-definition",
+    "--extern-html-root-url=core=https://doc.rust-lang.org",
+    "--extern-html-root-url=alloc=https://doc.rust-lang.org",
+    "--extern-html-root-url=std=https://doc.rust-lang.org",
+    "--extern-html-root-url=proc_macro=https://doc.rust-lang.org",
+]
 
 [package.metadata.playground]
 features = ["span-locations"]
@@ -24,8 +31,11 @@ features = ["span-locations"]
 unicode-ident = "1.0"
 
 [dev-dependencies]
-quote = { version = "1.0", default_features = false }
+flate2 = "1.0"
+quote = { version = "1.0", default-features = false }
+rayon = "1.0"
 rustversion = "1"
+tar = "0.4"
 
 [features]
 proc-macro = []
@@ -38,9 +48,6 @@ span-locations = []
 # This feature no longer means anything.
 nightly = []
 
-[lib]
-doc-scrape-examples = false
-
 [workspace]
 members = ["benches/bench-libproc-macro", "tests/ui"]
 

README.md

@@ -52,7 +52,7 @@ pub fn my_derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
 If parsing with [Syn], you'll use [`parse_macro_input!`] instead to propagate
 parse errors correctly back to the compiler when parsing fails.
 
-[`parse_macro_input!`]: https://docs.rs/syn/1.0/syn/macro.parse_macro_input.html
+[`parse_macro_input!`]: https://docs.rs/syn/2.0/syn/macro.parse_macro_input.html
 
 ## Unstable features
 
@@ -62,7 +62,7 @@ proc-macro2 by default.
 
 To opt into the additional APIs available in the most recent nightly compiler,
 the `procmacro2_semver_exempt` config flag must be passed to rustc. We will
-polyfill those nightly-only APIs back to Rust 1.31.0. As these are unstable APIs
+polyfill those nightly-only APIs back to Rust 1.56.0. As these are unstable APIs
 that track the nightly compiler, minor versions of proc-macro2 may make breaking
 changes to them at any time.