tree 2fed65fb12e34c83b495e67453c17a1e0b0b0987
parent ff8e52f171ed65b04993829f1f6fb7be54079661
author Alex Crichton <alex@alexcrichton.com> 1535416189 -0700
committer Alex Crichton <alex@alexcrichton.com> 1535416659 -0700

Automatically use rich API on 1.30.0+

This commit detects the rustc version in the build script of proc-macro2
to determine whether the compiler supports the necessary backend APIs.
This should hopefully allow the crate to compile on stable by default
but have a better implementation on 1.30.0+ compilers.