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)+) => { ... };
}

Constructs an event at the debug level.