Macro debug 

macro_rules! debug {
    (name: $name:expr, target: $target:expr, parent: $parent:expr, { $($field:tt)* }, $($arg:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, parent: $parent:expr, $($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, parent: $parent:expr, ?$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, parent: $parent:expr, %$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, parent: $parent:expr, $($arg:tt)+ ) => { ... };
    (name: $name:expr, target: $target:expr, { $($field:tt)* }, $($arg:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, $($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, ?$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, %$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, target: $target:expr, $($arg:tt)+ ) => { ... };
    (target: $target:expr, parent: $parent:expr, { $($field:tt)* }, $($arg:tt)* ) => { ... };
    (target: $target:expr, parent: $parent:expr, $($k:ident).+ $($field:tt)* ) => { ... };
    (target: $target:expr, parent: $parent:expr, ?$($k:ident).+ $($field:tt)* ) => { ... };
    (target: $target:expr, parent: $parent:expr, %$($k:ident).+ $($field:tt)* ) => { ... };
    (target: $target:expr, parent: $parent:expr, $($arg:tt)+ ) => { ... };
    (name: $name:expr, parent: $parent:expr, { $($field:tt)* }, $($arg:tt)* ) => { ... };
    (name: $name:expr, parent: $parent:expr, $($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, parent: $parent:expr, ?$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, parent: $parent:expr, %$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, parent: $parent:expr, $($arg:tt)+ ) => { ... };
    (name: $name:expr, { $($field:tt)* }, $($arg:tt)* ) => { ... };
    (name: $name:expr, $($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, ?$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, %$($k:ident).+ $($field:tt)* ) => { ... };
    (name: $name:expr, $($arg:tt)+ ) => { ... };
    (target: $target:expr, { $($field:tt)* }, $($arg:tt)* ) => { ... };
    (target: $target:expr, $($k:ident).+ $($field:tt)* ) => { ... };
    (target: $target:expr, ?$($k:ident).+ $($field:tt)* ) => { ... };
    (target: $target:expr, %$($k:ident).+ $($field:tt)* ) => { ... };
    (target: $target:expr, $($arg:tt)+ ) => { ... };
    (parent: $parent:expr, { $($field:tt)+ }, $($arg:tt)+ ) => { ... };
    (parent: $parent:expr, $($k:ident).+ = $($field:tt)*) => { ... };
    (parent: $parent:expr, ?$($k:ident).+ = $($field:tt)*) => { ... };
    (parent: $parent:expr, %$($k:ident).+ = $($field:tt)*) => { ... };
    (parent: $parent:expr, $($k:ident).+, $($field:tt)*) => { ... };
    (parent: $parent:expr, ?$($k:ident).+, $($field:tt)*) => { ... };
    (parent: $parent:expr, %$($k:ident).+, $($field:tt)*) => { ... };
    (parent: $parent:expr, $($arg:tt)+) => { ... };
    ({ $($field:tt)+ }, $($arg:tt)+ ) => { ... };
    ($($k:ident).+ = $($field:tt)*) => { ... };
    (?$($k:ident).+ = $($field:tt)*) => { ... };
    (%$($k:ident).+ = $($field:tt)*) => { ... };
    ($($k:ident).+, $($field:tt)*) => { ... };
    (?$($k:ident).+, $($field:tt)*) => { ... };
    (%$($k:ident).+, $($field:tt)*) => { ... };
    (?$($k:ident).+) => { ... };
    (%$($k:ident).+) => { ... };
    ($($k:ident).+) => { ... };
    ($($arg:tt)+) => { ... };
}

调试工具模块

提供条件编译的调试输出宏，只在开发模式下启用 条件调试宏 - 只在启用 debug-logs 特性时才输出 Constructs an event at the debug level.

This functions similarly to the event! macro. See the top-level documentation for details on the syntax accepted by this macro.

Examples

use tracing::debug;

let pos = Position { x: 3.234, y: -1.223 };

debug!(?pos.x, ?pos.y);
debug!(target: "app_events", position = ?pos, "New position");
debug!(name: "completed", position = ?pos);