tree a4081eaedfc7eb1275bca7916dd7dec9a30e8127
parent 857acc53aa7a3a9c4c0543fd6479acd042732866
author Olivier Goffart <ogoffart@woboq.com> 1542364570 +0100
committer Olivier Goffart <ogoffart@woboq.com> 1542364765 +0100

Allow to use procmacro2_semver_exempt on stable rust

procmacro2_semver_exempt is working on rust < 1.29, but
since 1.29, proc_macro2 forward to proc_macro even when
procmacro2_semver_exempt is set, which require a nightly
compiler