1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // The logic for parsing Kleene operators in macros has a special case to disambiguate `?`.
12 // Specifically, `$(pat)?` is the ZeroOrOne operator whereas `$(pat)?+` or `$(pat)?*` are the
13 // ZeroOrMore and OneOrMore operators using `?` as a separator. These tests are intended to
14 // exercise that logic in the macro parser.
16 // Moreover, we also throw in some tests for using a separator with `?`, which is meaningless but
17 // included for consistency with `+` and `*`.
19 // This test focuses on error cases.
21 #![feature(macro_at_most_once_rep)]
28 ($(a),?) => {} // comma separator is meaningless for `?`
31 macro_rules! barplus {
35 macro_rules! barstar {
40 foo!(a?a?a); //~ ERROR no rules expected the token `?`
41 foo!(a?a); //~ ERROR no rules expected the token `?`
42 foo!(a?); //~ ERROR no rules expected the token `?`
43 baz!(a?a?a); //~ ERROR no rules expected the token `?`
44 baz!(a?a); //~ ERROR no rules expected the token `?`
45 baz!(a?); //~ ERROR no rules expected the token `?`
46 baz!(a,); //~ ERROR unexpected end of macro invocation
47 baz!(a?a?a,); //~ ERROR no rules expected the token `?`
48 baz!(a?a,); //~ ERROR no rules expected the token `?`
49 baz!(a?,); //~ ERROR no rules expected the token `?`
50 barplus!(); //~ ERROR unexpected end of macro invocation
51 barplus!(a?); //~ ERROR unexpected end of macro invocation
52 barstar!(a?); //~ ERROR unexpected end of macro invocation