commit d7dc146ce5e584cd1bf91e817c7ac0942b89b47f
author David Tolnay <dtolnay@gmail.com> Fri Jul 19 11:48:47 2019 -0700
committer David Tolnay <dtolnay@gmail.com> Fri Jul 19 11:48:47 2019 -0700
tree 6291f90688b21e18c3c2f8cc116c519829f59de8
parent 8418d429976214e7da982f55bee5a140b1641555

Assume that proc_macro is new enough

build.rs

diff --git a/build.rs b/build.rs
index 2689473..4dc18a6 100644
--- a/build.rs
+++ b/build.rs
@@ -60,8 +60,7 @@
 
     println!("cargo:rustc-cfg=use_proc_macro");
 
-    // Rust 1.29 stabilized the necessary APIs in the `proc_macro` crate
-    if version.nightly || version.minor >= 29 && !semver_exempt {
+    if version.nightly || !semver_exempt {
         println!("cargo:rustc-cfg=wrap_proc_macro");
     }