parser: fix panic for struct field with new style @[attribute], with …

…an enum default value after it

vlib/v/parser/parse_type.v

@@ -547,7 +547,8 @@ fn (mut p Parser) parse_any_type(language ast.Language, is_ptr bool, check_dot b
 		name = 'C.${name}'
 	} else if language == .js {
 		name = 'JS.${name}'
-	} else if p.peek_tok.kind == .dot && check_dot && !name[0].is_capital() {
+	} else if p.peek_tok.kind == .dot && check_dot && p.tok.lit.len > 0
+		&& !p.tok.lit[0].is_capital() {
 		// `module.Type`
 		mut mod := name
 		mut mod_pos := p.tok.pos()

vlib/v/parser/tests/expecting_type_declaration_for_new_attribute_field_followed_by_enum_default_value.out

@@ -0,0 +1,6 @@
+vlib/v/parser/tests/expecting_type_declaration_for_new_attribute_field_followed_by_enum_default_value.vv:9:23: error: expecting type declaration
+    7 |     s string
+    8 |     i int
+    9 |     e MyEnum @[required] = .a
+      |                          ^
+   10 | }

vlib/v/parser/tests/expecting_type_declaration_for_new_attribute_field_followed_by_enum_default_value.vv

@@ -0,0 +1,10 @@
+enum MyEnum {
+	a
+	b
+}
+
+struct MyStruct {
+	s string
+	i int
+	e MyEnum @[required] = .a
+}