Update supported compiler in description of semver exempt polyfill

dtolnay · Jul 16, 2023 · 11d8cab · 11d8cab
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diff --git a/README.md b/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 1.31.0. 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.
 

diff --git a/src/lib.rs b/src/lib.rs
@@ -65,7 +65,7 @@
 //!
 //! 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 1.31.0. As
+//! rustc. We will 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.
 //!