https://git.ruby-lang.org/ruby.git/commit/?id=4a31c1e45d

From 4a31c1e45d12b7813096948616f8a03224f20ac8 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 30 May 2019 12:35:27 +0900
Subject: parse.y: continue after heredoc error

* parse.y: continue parsing the rest of the here-document starting
  line, after the terminator was not found.

diff --git a/parse.y b/parse.y
index 24b8e2e..5b33ef4 100644
--- a/parse.y
+++ b/parse.y
@@ -6016,12 +6016,17 @@ nextline(struct parser_params *p) https://github.com/ruby/ruby/blob/trunk/parse.y#L6016
 	    return -1;
 
 	if (!p->lex.input || NIL_P(v = lex_getline(p))) {
+	  end_of_input:
 	    p->eofp = 1;
 	    lex_goto_eol(p);
 	    return -1;
 	}
 	p->cr_seen = FALSE;
     }
+    else if (NIL_P(v)) {
+	/* after here-document without terminator */
+	goto end_of_input;
+    }
     add_delayed_token(p, p->lex.ptok, p->lex.pend);
     if (p->heredoc_end > 0) {
 	p->ruby_sourceline = p->heredoc_end;
@@ -6056,7 +6061,7 @@ nextc(struct parser_params *p) https://github.com/ruby/ruby/blob/trunk/parse.y#L6061
 {
     int c;
 
-    if (UNLIKELY((p->lex.pcur == p->lex.pend) || p->eofp || p->lex.nextline)) {
+    if (UNLIKELY((p->lex.pcur == p->lex.pend) || p->eofp || RTEST(p->lex.nextline))) {
 	if (nextline(p)) return -1;
     }
     c = (unsigned char)*p->lex.pcur++;
@@ -7003,6 +7008,8 @@ heredoc_restore(struct parser_params *p, rb_strterm_heredoc_t *here) https://github.com/ruby/ruby/blob/trunk/parse.y#L7008
     p->heredoc_end = p->ruby_sourceline;
     p->ruby_sourceline = (int)here->sourceline;
     token_flush(p);
+    if (p->eofp) p->lex.nextline = Qnil;
+    p->eofp = 0;
 }
 
 static int
@@ -7260,7 +7267,8 @@ here_document(struct parser_params *p, rb_strterm_heredoc_t *here) https://github.com/ruby/ruby/blob/trunk/parse.y#L7267
       restore:
 	heredoc_restore(p, &p->lex.strterm->u.heredoc);
 	p->lex.strterm = 0;
-	return 0;
+	SET_LEX_STATE(EXPR_END);
+	return tSTRING_END;
     }
     bol = was_bol(p);
     if (!bol) {
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 4e52bc4..6fdca37 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -901,6 +901,12 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/test_syntax.rb#L901
     assert_syntax_error("puts <<""EOS\n""ng\n""EOS\r""NO\n", /can't find string "EOS" anywhere before EOF/)
   end
 
+  def test_heredoc_no_terminator
+    assert_syntax_error("puts <<""A\n", /can't find string "A" anywhere before EOF/)
+    assert_syntax_error("puts <<""A + <<""B\n", /can't find string "A" anywhere before EOF/)
+    assert_syntax_error("puts <<""A + <<""B\n", /can't find string "B" anywhere before EOF/)
+  end
+
   def test_unterminated_heredoc
     assert_syntax_error("<<\"EOS\n\nEOS\n", /unterminated/)
     assert_syntax_error("<<\"EOS\n\"\nEOS\n", /unterminated/)
-- 
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