Fixed parsing of export default declarations.

With non-assignment expression.
diff --git a/src/njs_parser.c b/src/njs_parser.c
index fc8adc0..7a89f7e 100644
--- a/src/njs_parser.c
+++ b/src/njs_parser.c
@@ -7468,7 +7468,7 @@
     node->token_line = parser->line;
     parser->node = node;
 
-    njs_parser_next(parser, njs_parser_expression);
+    njs_parser_next(parser, njs_parser_assignment_expression);
 
     return njs_parser_after(parser, current, node, 1, njs_parser_export_after);
 }
@@ -7478,6 +7478,10 @@
 njs_parser_export_after(njs_parser_t *parser, njs_lexer_token_t *token,
     njs_queue_link_t *current)
 {
+    if (njs_parser_expect_semicolon(parser, token) != NJS_OK) {
+        return njs_parser_failed(parser);
+    }
+
     parser->target->right = parser->node;
     parser->node = parser->target;
 
diff --git a/test/module/export_non_assignment.js b/test/module/export_non_assignment.js
new file mode 100644
index 0000000..e501731
--- /dev/null
+++ b/test/module/export_non_assignment.js
@@ -0,0 +1 @@
+export default 10, 11;
diff --git a/test/njs_expect_test.exp b/test/njs_expect_test.exp
index e179f41..cca2b05 100644
--- a/test/njs_expect_test.exp
+++ b/test/njs_expect_test.exp
@@ -749,6 +749,8 @@
      "Identifier \"default\" has already been declared in export.js:5\r\n"}
     {"import m from 'export_non_default.js'\r\n"
      "Non-default export is not supported in export_non_default.js:3\r\n"}
+    {"import m from 'export_non_assignment.js'\r\n"
+     "Unexpected token \",\" in export_non_assignment.js:1\r\n"}
     {"import ref from 'ref_exception.js'\r\n"
      "ReferenceError: \"undeclared\" is not defined"}
     {"var ref\r\n"