From a58b4eee25b79432d98a1c665edaf5ec0a054b2e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 12 Nov 2019 17:14:10 +0900
Subject: Warn on `...` at EOL

---
 parse.y | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'parse.y')

diff --git a/parse.y b/parse.y
index 0bda2d2db0..6d0564476d 100644
--- a/parse.y
+++ b/parse.y
@@ -9235,6 +9235,9 @@ parser_yylex(struct parser_params *p)
 	switch (c = nextc(p)) {
 	  case '.':
 	    if ((c = nextc(p)) == '.') {
+		if (p->lex.paren_nest == 0 && looking_at_eol_p(p)) {
+		    rb_warn0("... at EOL, should be parenthesized?");
+		}
 		return is_beg ? tBDOT3 : tDOT3;
 	    }
 	    pushback(p, c);
-- 
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