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expand

tex_engine

Macro expand 

Source 
macro_rules! expand {
    ($engine:ident,$tk:expr;$($case:tt)*) => { ... };
    ($ET:ty; $engine:ident,$token:expr;$($case:tt)*) => { ... };
}
Expand description

Expands the provided token or, if not expandable, matches the ResolvedToken against the provided $case patterns.