add regression for #1563

mrbgems/mruby-bin-mirb/bintest/mirb.rb

@@ -0,0 +1,12 @@
+require 'open3'
+
+assert('mirb normal operations') do
+  o, s = Open3.capture2('bin/mirb', :stdin_data => "a=1\nb=2\na+b\n")
+  assert_true o.include?('=> 3')
+  assert_true o.include?('=> 2')
+end
+
+assert('regression for #1563') do
+  o, s = Open3.capture2('bin/mirb', :stdin_data => "a=1;b=2;c=3\nb\nc")
+  assert_true o.include?('=> 3')
+end