Macro output_str 

macro_rules! output_str {
    ($($tokens:tt)*) => { ... };
}

Emit formatted string as token stream

Example:

output_str!("foo + 2");

This will spit foo + 2 token stream (ident, punct, literal) as output of the macro, just before emitting result. The format of input is the same as in format! macro.

Note: If input is invalid TokenStream this will emit compile error.