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/// Fail due to an unexpected input token.
///
/// The compiler's error will indicate the source of the unexpected token to the
/// user.
///
/// ```compile_fail
/// use tt_call::error_unexpected;
///
/// fn main() {
/// error_unexpected! { true }
/// }
/// ```
///
/// ```text
/// error: no rules expected the token `true`
/// --> src/unexpected.rs:5:25
/// |
/// 5 | error_unexpected! { true }
/// | ^^^^
/// ```
/// Fail due to an unexpected end of input.
///
/// The resulting compiler error is typically not good. Always prefer to use
/// `error_unexpected!` or `error_unexpected_last!` if there are tokens on which
/// an error could reasonably be triggered.
///
/// ```compile_fail
/// use tt_call::error_eof;
///
/// fn main() {
/// error_eof!{}
/// }
/// ```
///
/// ```text
/// error: unexpected end of macro invocation
/// --> src/unexpected.rs:5:5
/// |
/// 5 | error_eof!{}
/// | ^^^^^^^^^^^^
/// ```
/// Fail due to an unexpected input token, faulting the last token.
///
/// The compiler's error will indicate the source of the unexpected token to the
/// user.
///
/// ```compile_fail
/// use tt_call::error_unexpected_last;
///
/// fn main() {
/// error_unexpected_last! { aaa bbb ccc }
/// }
/// ```
///
/// ```text
/// error: no rules expected the token `true`
/// --> src/unexpected.rs:5:38
/// |
/// 5 | error_unexpected_last! { aaa bbb ccc }
/// | ^^^
/// ```