From bd70f0fa66853125797bfa4cdea37b9ca2120159 Mon Sep 17 00:00:00 2001
From: Pulkit Goyal <7895pulkit@gmail.com>
Date: Tue, 16 Jan 2018 19:09:32 +0530
Subject: [PATCH] add a comment about parsing only prefix in header.rs

---
 src/tools/compiletest/src/header.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
index a10372fd745..ff662736bdd 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/header.rs
@@ -41,6 +41,8 @@ impl EarlyProps {
         iter_header(testfile,
                     None,
                     &mut |ln| {
+            // we should check if any only-<platform> exists and if it exists
+            // and does not matches the current platform, skip the test
             props.ignore =
                 props.ignore ||
                 config.parse_cfg_name_directive(ln, "ignore") ||