3 files changed, 9 insertions, 3 deletions
diff --git a/parse.y b/parse.y
index c38bfe2508..8e50087c26 100644
--- a/parse.y
+++ b/parse.y
@@ -8108,8 +8108,8 @@ parser_yylex(struct parser_params *parser)
 	    }
 	    goto retry;
 	}
-	while ((c = nextc())) {
-	    switch (c) {
+	while (1) {
+	    switch (c = nextc()) {
 	      case ' ': case '\t': case '\f': case '\r':
 	      case '\13': /* '\v' */
 		space_seen = 1;
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 78a7ab8c90..c4b8e45ce0 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -993,6 +993,12 @@ x = __ENCODING__
     assert_equal(line, obj.location.lineno, bug)
   end
 
+  def test_eof_in_def
+    assert_raise(SyntaxError) { eval("def m\n\0""end") }
+    assert_raise(SyntaxError) { eval("def m\n\C-d""end") }
+    assert_raise(SyntaxError) { eval("def m\n\C-z""end") }
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}
diff --git a/version.h b/version.h
index eb60ac93e5..0133ec9099 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.4.4"
 #define RUBY_RELEASE_DATE "2018-03-20"
-#define RUBY_PATCHLEVEL 266
+#define RUBY_PATCHLEVEL 267
 
 #define RUBY_RELEASE_YEAR 2018
 #define RUBY_RELEASE_MONTH 3