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//! Macros useful when writing procedural syntax extensions.
//!
//! The macros themselves are ordinary `macro_rules!` macros.
/// Call `span_err` on an `ExtCtxt` and return `DummyResult::any`.
#[macro_export]
macro_rules! ext_bail {
($cx:expr, $sp:expr, $msg:expr) => {{
$cx.span_err($sp, $msg);
return ::syntax::ext::base::DummyResult::any($sp);
}}
}
/// `ext_bail!` if the condition `$e` is true.
#[macro_export]
macro_rules! ext_bail_if {
($e:expr, $cx:expr, $sp:expr, $msg:expr) => {{
if $e { ext_bail!($cx, $sp, $msg) }
}}
}
/// Unwrap the `Option` `$e`, or `ext_bail!`.
#[macro_export]
macro_rules! ext_expect {
($cx:expr, $sp:expr, $e:expr, $msg:expr) => {{
match $e {
Some(x) => x,
None => ext_bail!($cx, $sp, $msg),
}
}}
}
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