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Make write/print macros eagerly drop temporaries

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This commit is contained in:
David Tolnay 2022-04-26 15:16:23 -07:00
parent ae29890ab6
commit 0502496b1e
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2 changed files with 14 additions and 12 deletions
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14
library/core/src/macros/mod.rs
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@ -496,9 +496,10 @@ macro_rules! r#try {
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
#[cfg_attr(not(test), rustc_diagnostic_item = "write_macro")] #[cfg_attr(not(test), rustc_diagnostic_item = "write_macro")]
macro_rules! write { macro_rules! write {
($dst:expr, $($arg:tt)*) => { ($dst:expr, $($arg:tt)*) => {{
$dst.write_fmt($crate::format_args!($($arg)*)) let result = $dst.write_fmt($crate::format_args!($($arg)*));
}; result
}};
} }
/// Write formatted data into a buffer, with a newline appended. /// Write formatted data into a buffer, with a newline appended.
@ -553,9 +554,10 @@ macro_rules! writeln {
($dst:expr $(,)?) => { ($dst:expr $(,)?) => {
$crate::write!($dst, "\n") $crate::write!($dst, "\n")
}; };
($dst:expr, $($arg:tt)*) => { ($dst:expr, $($arg:tt)*) => {{
$dst.write_fmt($crate::format_args_nl!($($arg)*)) let result = $dst.write_fmt($crate::format_args_nl!($($arg)*));
}; result
}};
} }
/// Indicates unreachable code. /// Indicates unreachable code.

12
library/std/src/macros.rs
View file

@ -62,9 +62,9 @@ macro_rules! panic {
#[cfg_attr(not(test), rustc_diagnostic_item = "print_macro")] #[cfg_attr(not(test), rustc_diagnostic_item = "print_macro")]
#[allow_internal_unstable(print_internals)] #[allow_internal_unstable(print_internals)]
macro_rules! print { macro_rules! print {
($($arg:tt)*) => { ($($arg:tt)*) => {{
$crate::io::_print($crate::format_args!($($arg)*)) $crate::io::_print($crate::format_args!($($arg)*));
}; }};
} }
/// Prints to the standard output, with a newline. /// Prints to the standard output, with a newline.
@ -133,9 +133,9 @@ macro_rules! println {
#[cfg_attr(not(test), rustc_diagnostic_item = "eprint_macro")] #[cfg_attr(not(test), rustc_diagnostic_item = "eprint_macro")]
#[allow_internal_unstable(print_internals)] #[allow_internal_unstable(print_internals)]
macro_rules! eprint { macro_rules! eprint {
($($arg:tt)*) => { ($($arg:tt)*) => {{
$crate::io::_eprint($crate::format_args!($($arg)*)) $crate::io::_eprint($crate::format_args!($($arg)*));
}; }};
} }
/// Prints to the standard error, with a newline. /// Prints to the standard error, with a newline.