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1 // Copyright 2012-2013 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.
4 //
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.
10
11 /// Deprecated fmt! syntax extension
12
13 use ast;
14 use codemap::Span;
15 use ext::base;
16 use ext::build::AstBuilder;
17
18
19 pub fn expand_syntax_ext(ecx: &mut base::ExtCtxt,
20                          sp: Span,
21                          _tts: &[ast::TokenTree])
22                          -> Box<base::MacResult> {
23     ecx.span_err(sp, "`fmt!` is deprecated, use `format!` instead");
24     ecx.parse_sess.span_diagnostic.span_note(sp,
25         "see http://static.rust-lang.org/doc/master/std/fmt/index.html \
26          for documentation");
27
28     base::MacExpr::new(ecx.expr_uint(sp, 2))
29 }