Fix build

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

0001-build.rs-Simplify-check-for-version.patch

@@ -0,0 +1,36 @@
+From e7626a25471d2db29e7cdee81308ee4604b41544 Mon Sep 17 00:00:00 2001
+From: Igor Raits <i.gnatenko.brain@gmail.com>
+Date: Mon, 2 Mar 2020 12:14:11 +0100
+Subject: [PATCH] build.rs: Simplify check for version
+
+This also fixes build with rustc shipped by distributions.
+
+Fixes: https://gitlab.com/CreepySkeleton/proc-macro-error/issues/8
+Signed-off-by: Igor Raits <i.gnatenko.brain@gmail.com>
+---
+ build.rs | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/build.rs b/build.rs
+index 17cf408..3c1196f 100644
+--- a/build.rs
++++ b/build.rs
+@@ -1,11 +1,11 @@
+ fn main() {
+-    let (version, channel, _) = version_check::triple().unwrap();
+-
+-    if !channel.is_nightly() {
++    if !version_check::is_feature_flaggable().unwrap_or(false) {
+         println!("cargo:rustc-cfg=use_fallback");
+     }
+ 
+-    if version.at_most("1.38.0") || !channel.is_stable() {
++    if version_check::is_max_version("1.38.0").unwrap_or(false)
++        || !version_check::Channel::read().unwrap().is_stable()
++    {
+         println!("cargo:rustc-cfg=skip_ui_tests");
+     }
+ }
+-- 
+2.25.1
+

rust-proc-macro-error.spec

@@ -17,6 +17,8 @@ Source:         %{crates_source}
 # Initial patched metadata
 # * unpin the toml dependency
 Patch0:         proc-macro-error-fix-metadata.diff
+# https://gitlab.com/CreepySkeleton/proc-macro-error/-/merge_requests/25
+Patch0001:      0001-build.rs-Simplify-check-for-version.patch
 
 ExclusiveArch:  %{rust_arches}
 %if %{__cargo_skip_build}