Raise required compiler to Rust 1.60

Author: dtolnay

.github/workflows/ci.yml

@@ -101,14 +101,14 @@ jobs:
       - run: cargo test --test test_size --no-default-features --features span-locations
 
   msrv:
-    name: Rust 1.56.0
+    name: Rust 1.60.0
     needs: pre_ci
     if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.56.0
+      - uses: dtolnay/rust-toolchain@1.60.0
         with:
           components: rust-src
       - run: cargo check

Cargo.toml

@@ -10,7 +10,7 @@ edition = "2021"
 keywords = ["macros", "syn"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/proc-macro2"
-rust-version = "1.56"
+rust-version = "1.60"
 
 [package.metadata.docs.rs]
 rustc-args = ["--cfg=procmacro2_semver_exempt"]

README.md

@@ -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 1.56.0. As these are unstable APIs
+polyfill those nightly-only APIs back to Rust 1.60.0. As these are unstable APIs
 that track the nightly compiler, minor versions of proc-macro2 may make breaking
 changes to them at any time.
 

src/lib.rs

@@ -63,7 +63,7 @@
 //!
 //! 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 1.56.0. As
+//! rustc. We will polyfill those nightly-only APIs back to Rust 1.60.0. As
 //! these are unstable APIs that track the nightly compiler, minor versions of
 //! proc-macro2 may make breaking changes to them at any time.
 //!