hcl: multi-line comments aren't allowed to terminate with EOF

decoder_test.go

@@ -196,6 +196,12 @@ func TestDecode_interface(t *testing.T) {
 				"bar": "value",
 			},
 		},
+
+		{
+			"unterminated_block_comment.hcl",
+			true,
+			nil,
+		},
 	}
 
 	for _, tc := range cases {

hcl/lex.go

@@ -125,7 +125,14 @@ func (x *hclLex) consumeComment(c rune) bool {
 		c = x.next()
 		if c == lexEOF {
 			x.backup()
-			return true
+			if single {
+				// Single line comments can end with an EOF
+				return true
+			}
+
+			// Multi-line comments must end with a */
+			x.createErr(fmt.Sprintf("end of multi-line comment expected, got EOF"))
+			return false
 		}
 
 		// Single line comments continue until a '\n'

test-fixtures/unterminated_block_comment.hcl

@@ -0,0 +1,2 @@
+/*
+Foo