https://git.ruby-lang.org/ruby.git/commit/?id=e13da00824

From e13da00824e0979b2417bcffe94a8668cab7532c Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Tue, 3 Sep 2019 01:25:58 +0900
Subject: Explain how to run an individual btest in help


diff --git a/common.mk b/common.mk
index 16b41b2..3074b0f 100644
--- a/common.mk
+++ b/common.mk
@@ -1505,7 +1505,7 @@ help: PHONY https://github.com/ruby/ruby/blob/trunk/common.mk#L1505
 	"  gdb:                 runs test.rb by miniruby under gdb" \
 	"  gdb-ruby:            runs test.rb by ruby under gdb" \
 	"  check:               equals make test test-tool test-all test-spec" \
-	"  test:                ruby core tests" \
+	"  test:                ruby core tests [BTESTS=<bootstraptest files>]" \
 	"  test-all:            all ruby tests [TESTOPTS=-j4 TESTS=<test files>]" \
 	"  test-spec:           run the Ruby spec suite [SPECOPTS=<specs, opts>]" \
 	"  test-bundler:        run the Bundler spec" \
-- 
cgit v0.10.2


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