include_tt 1.1.0

Macros for ultra-flexible injection of compiler trees, literals, or binary data into Rust syntax trees from external sources.
Documentation 
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/// A small macro that allows you to create an error tree and either
/// return it to the calling function or break it in a loop
macro_rules! throw_sg_err {
	// return macro `compile_error!`.
	[ return $($tt:tt)* ] => {
		return throw_sg_err! {
			$($tt)*
		}
	};

	// break macro `compile_error!` with a concatenator.
	[ break $($tt:tt)* ] => {
		break throw_sg_err! {
			$($tt)*
		}
	};

	// macro `compile_error!`.
	[ [$span:expr]: $err:expr $(,)? ] => {
		quote::quote_spanned! {
			$span =>
			compile_error!($err);
		}.into()
	};

	// macro `compile_error!` with a concatenator.
	[ [$span:expr]: $($err:tt)+ ] => {
		quote::quote_spanned! {
			$span =>
			compile_error!(
				concat!( $($err)+ )
			);
		}.into()
	};
}