parse.y: else without rescue

* parse.y (bodystmt): [EXPERIMENTAL] make `else` without `rescue`
  a syntax error.  [DevelopersMeeting20180315Japan]

  https://bugs.ruby-lang.org/projects/ruby/wiki/DevelopersMeeting20180315Japan
  https://docs.google.com/document/d/1RT0ijSo8uJ4Awn3CEvuYkjH0TVeXSYgeAFNmVGYC3ak/edit#
  > * do-else-end
  >   https://twitter.com/joker1007/status/974173396006129664
  >   https://twitter.com/joker1007/status/974173641347756032
  >   https://twitter.com/joker1007/status/974176512554369027
  >   Will be SyntaxError in 2.6-preview2
  >   All of begin/do/def (experimental)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62901 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index f838d3cb05..5f7bd2abe2 100644
--- a/parse.y
+++ b/parse.y
@@ -1000,7 +1000,7 @@ bodystmt	: compstmt
 			    $$ = NEW_RESCUE($1, $2, $3, &@$);
 			}
 			else if ($3) {
-			    rb_warn0("else without rescue is useless");
+			    compile_error(p, "else without rescue is useless");
 			    $$ = block_append(p, $$, $3);
 			}
 			if ($4) {