Macro bitbuffer_mut 

macro_rules! bitbuffer_mut {
    (@bit 0) => { ... };
    (@bit 1) => { ... };
    () => { ... };
    (0) => { ... };
    (1) => { ... };
    ($elem:expr; $n:expr) => { ... };
    ($($x:expr),+ $(,)?) => { ... };
    ($($bit:tt)+) => { ... };
}

A macro for constructing bit-buffers akin to vec![..].

Supports multiple syntaxes:

• bitbuffer_mut![] - empty buffer
• bitbuffer_mut![value; count] - fill with value
• bitbuffer_mut![expr, expr, ...] - comma-separated boolean expressions
• bitbuffer_mut![0 1 0 1] - space-separated bit literals (0s and 1s)