Coverage on non-positive lines

* compile.c (ADD_TRACE): ignore trace instruction on non-positive
  line.
* parse.y (coverage): get rid of ArgumentError when the starting
  line number is not positive.  [ruby-core:76141] [Bug #12517]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/coverage/test_coverage.rb b/test/coverage/test_coverage.rb
index 8bc1104d75..0753ccddc5 100644
--- a/test/coverage/test_coverage.rb
+++ b/test/coverage/test_coverage.rb
@@ -110,4 +110,13 @@ class TestCoverage < Test::Unit::TestCase
   ensure
     $".replace loaded_features
   end
+
+  def test_nonpositive_linenumber
+    bug12517 = '[ruby-core:76141] [Bug #12517]'
+    Coverage.start
+    assert_nothing_raised(ArgumentError, bug12517) do
+      RubyVM::InstructionSequence.compile(":ok", nil, "<compiled>", 0)
+    end
+    assert_include Coverage.result, "<compiled>"
+  end
 end unless ENV['COVERAGE']