971d776aa5
This came up when working [on the gl-rs generator extension](990383de80/src/gl_generator/lib.rs (L135-L146)).
The new definition of `TTDelim` adds an associated `Span` that covers the whole token tree and enforces the invariant that a delimited sequence of token trees must have an opening and closing delimiter.
A `get_span` method has also been added to `TokenTree` type to make it easier to implement better error messages for syntax extensions.
28 lines
928 B
Rust
28 lines
928 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast;
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use codemap;
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use ext::base;
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use print;
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pub fn expand_syntax_ext<'cx>(cx: &'cx mut base::ExtCtxt,
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sp: codemap::Span,
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tts: &[ast::TokenTree])
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-> Box<base::MacResult+'cx> {
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cx.print_backtrace();
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println!("{}", print::pprust::tts_to_string(tts));
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// any so that `log_syntax` can be invoked as an expression and item.
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base::DummyResult::any(sp)
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}
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