76c313ceb1
If you were writing to something along the lines of `self.foo` then with the new closure rules it meant that you were borrowing `self` for the entirety of the closure, meaning that you couldn't format other fields of `self` at the same time as writing to a buffer contained in `self`. By lifting the borrow outside of the closure the borrow checker can better understand that you're only borrowing one of the fields at a time. This had to use type ascription as well in order to preserve trait object coercions.
186 lines
4.8 KiB
Rust
186 lines
4.8 KiB
Rust
// Copyright 2014 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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#[macro_escape];
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#[macro_export]
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macro_rules! log(
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($lvl:expr, $($arg:tt)+) => ({
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let lvl = $lvl;
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if lvl <= __log_level() {
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format_args!(|args| {
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::std::logging::log(lvl, args)
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}, $($arg)+)
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}
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})
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)
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#[macro_export]
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macro_rules! error(
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($($arg:tt)*) => (log!(1u32, $($arg)*))
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)
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#[macro_export]
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macro_rules! warn(
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($($arg:tt)*) => (log!(2u32, $($arg)*))
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)
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#[macro_export]
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macro_rules! info(
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($($arg:tt)*) => (log!(3u32, $($arg)*))
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)
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#[macro_export]
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macro_rules! debug(
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($($arg:tt)*) => (if cfg!(not(ndebug)) { log!(4u32, $($arg)*) })
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)
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#[macro_export]
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macro_rules! log_enabled(
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($lvl:expr) => ({
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let lvl = $lvl;
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lvl <= __log_level() && (lvl != 4 || cfg!(not(ndebug)))
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})
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)
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#[macro_export]
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macro_rules! fail(
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() => (
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fail!("explicit failure")
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);
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($msg:expr) => (
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::std::rt::begin_unwind($msg, file!(), line!())
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);
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($fmt:expr, $($arg:tt)*) => ({
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// a closure can't have return type !, so we need a full
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// function to pass to format_args!, *and* we need the
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// file and line numbers right here; so an inner bare fn
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// is our only choice.
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#[inline]
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fn run_fmt(fmt: &::std::fmt::Arguments) -> ! {
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::std::rt::begin_unwind_fmt(fmt, file!(), line!())
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}
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format_args!(run_fmt, $fmt, $($arg)*)
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});
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)
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#[macro_export]
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macro_rules! assert(
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($cond:expr) => (
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if !$cond {
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fail!("assertion failed: {:s}", stringify!($cond))
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}
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);
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($cond:expr, $msg:expr) => (
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if !$cond {
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fail!($msg)
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}
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);
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($cond:expr, $($arg:expr),+) => (
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if !$cond {
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fail!($($arg),+)
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}
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);
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)
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#[macro_export]
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macro_rules! assert_eq(
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($given:expr , $expected:expr) => ({
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let given_val = &($given);
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let expected_val = &($expected);
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// check both directions of equality....
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if !((*given_val == *expected_val) &&
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(*expected_val == *given_val)) {
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fail!("assertion failed: `(left == right) && (right == left)` \
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(left: `{:?}`, right: `{:?}`)", *given_val, *expected_val)
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}
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})
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)
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/// A utility macro for indicating unreachable code. It will fail if
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/// executed. This is occasionally useful to put after loops that never
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/// terminate normally, but instead directly return from a function.
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///
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/// # Example
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///
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/// ~~~rust
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/// fn choose_weighted_item(v: &[Item]) -> Item {
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/// assert!(!v.is_empty());
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/// let mut so_far = 0u;
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/// for item in v.iter() {
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/// so_far += item.weight;
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/// if so_far > 100 {
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/// return item;
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/// }
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/// }
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/// // The above loop always returns, so we must hint to the
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/// // type checker that it isn't possible to get down here
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/// unreachable!();
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/// }
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/// ~~~
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#[macro_export]
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macro_rules! unreachable(
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() => (fail!("internal error: entered unreachable code"))
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)
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/// A standardised placeholder for marking unfinished code. It fails with the
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/// message `"not yet implemented"` when executed.
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#[macro_export]
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macro_rules! unimplemented(
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() => (fail!("not yet implemented"))
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)
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#[macro_export]
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macro_rules! format(
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($($arg:tt)*) => (
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format_args!(::std::fmt::format, $($arg)*)
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)
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)
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#[macro_export]
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macro_rules! write(
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($dst:expr, $($arg:tt)*) => ({
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let dst: &mut ::std::io::Writer = $dst;
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format_args!(|args| { ::std::fmt::write(dst, args) }, $($arg)*)
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})
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)
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#[macro_export]
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macro_rules! writeln(
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($dst:expr, $($arg:tt)*) => ({
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let dst: &mut ::std::io::Writer = $dst;
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format_args!(|args| { ::std::fmt::writeln(dst, args) }, $($arg)*)
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})
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)
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#[macro_export]
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macro_rules! print(
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($($arg:tt)*) => (format_args!(::std::io::stdio::print_args, $($arg)*))
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)
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#[macro_export]
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macro_rules! println(
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($($arg:tt)*) => (format_args!(::std::io::stdio::println_args, $($arg)*))
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)
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#[macro_export]
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macro_rules! local_data_key(
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($name:ident: $ty:ty) => (
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static $name: ::std::local_data::Key<$ty> = &::std::local_data::Key;
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);
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(pub $name:ident: $ty:ty) => (
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pub static $name: ::std::local_data::Key<$ty> = &::std::local_data::Key;
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);
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)
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#[macro_export]
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macro_rules! if_ok(
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($e:expr) => (match $e { Ok(e) => e, Err(e) => return Err(e) })
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)
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