adapton::thunk!

macro_rules! thunk {
    ( $st:expr , $nm:expr =>> $f:ident :: < $( $ty:ty ),* > , $( $lab:ident : $arg:expr ),* ) => { ... };
    ( $st:expr , $nm:expr =>> $f:ident , $( $lab:ident : $arg:expr ),* ) => { ... };
    ( $st:expr , $f:ident :: < $( $ty:ty ),* > , $( $lab:ident : $arg:expr ),* ) => { ... };
    ( $st:expr , $f:path , $( $lab:ident : $arg:expr ),* ) => { ... };
}