Set first line numbers for empty iseqs.

* compile.c (iseq_compile_each): for empty method, block and so on,
  `last_line` is not set so that line number of `putnil` instruction
  will be zero. This patch set `first_lineno` for such `putnil`.

  Problem is reported by deivid-rodriguez via Yuichiro Kaneko.

* test/ruby/test_iseq.rb: add a test for this spec.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61457 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/compile.c b/compile.c
index 0c966a7b4b..ef6a7cf89c 100644
--- a/compile.c
+++ b/compile.c
@@ -5413,8 +5413,10 @@ iseq_compile_each(rb_iseq_t *iseq, LINK_ANCHOR *ret, const NODE *node, int poppe
 {
     if (node == 0) {
 	if (!popped) {
+	    int lineno = ISEQ_COMPILE_DATA(iseq)->last_line;
+	    if (lineno == 0) lineno = FIX2INT(rb_iseq_first_lineno(iseq));
 	    debugs("node: NODE_NIL(implicit)\n");
-	    ADD_INSN(ret, ISEQ_COMPILE_DATA(iseq)->last_line, putnil);
+	    ADD_INSN(ret, lineno, putnil);
 	}
 	return COMPILE_OK;
     }