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, 1 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 362dea7721..064aee8aea 100644
--- a/parse.y
+++ b/parse.y
@@ -5493,7 +5493,7 @@ coverage(VALUE fname, int n)
 {
     VALUE coverages = rb_get_coverages();
     if (RTEST(coverages) && RBASIC(coverages)->klass == 0) {
-	VALUE lines = rb_ary_tmp_new_fill(n);
+	VALUE lines = n > 0 ? rb_ary_tmp_new_fill(n) : rb_ary_tmp_new(0);
 	rb_hash_aset(coverages, fname, lines);
 	return lines;
     }