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|
/// A macro for triggering an ICE.
/// Calling `bug` instead of panicking will result in a nicer error message and should
/// therefore be preferred over `panic`/`unreachable` or others.
///
/// If you have a span available, you should use [`span_bug`] instead.
///
/// If the bug should only be emitted when compilation didn't fail, [`Session::delay_span_bug`] may be useful.
///
/// [`Session::delay_span_bug`]: rustc_session::Session::delay_span_bug
/// [`span_bug`]: crate::span_bug
#[macro_export]
macro_rules! bug {
() => ( $crate::bug!("impossible case reached") );
($msg:expr) => ({ $crate::util::bug::bug_fmt(::std::format_args!($msg)) });
($msg:expr,) => ({ $crate::bug!($msg) });
($fmt:expr, $($arg:tt)+) => ({
$crate::util::bug::bug_fmt(::std::format_args!($fmt, $($arg)+))
});
}
/// A macro for triggering an ICE with a span.
/// Calling `span_bug!` instead of panicking will result in a nicer error message and point
/// at the code the compiler was compiling when it ICEd. This is the preferred way to trigger
/// ICEs.
///
/// If the bug should only be emitted when compilation didn't fail, [`Session::delay_span_bug`] may be useful.
///
/// [`Session::delay_span_bug`]: rustc_session::Session::delay_span_bug
#[macro_export]
macro_rules! span_bug {
($span:expr, $msg:expr) => ({ $crate::util::bug::span_bug_fmt($span, ::std::format_args!($msg)) });
($span:expr, $msg:expr,) => ({ $crate::span_bug!($span, $msg) });
($span:expr, $fmt:expr, $($arg:tt)+) => ({
$crate::util::bug::span_bug_fmt($span, ::std::format_args!($fmt, $($arg)+))
});
}
///////////////////////////////////////////////////////////////////////////
// Lift and TypeFoldable/TypeVisitable macros
//
// When possible, use one of these (relatively) convenient macros to write
// the impls for you.
#[macro_export]
macro_rules! CloneLiftImpls {
($($ty:ty),+ $(,)?) => {
$(
impl<'tcx> $crate::ty::Lift<'tcx> for $ty {
type Lifted = Self;
fn lift_to_tcx(self, _: $crate::ty::TyCtxt<'tcx>) -> Option<Self> {
Some(self)
}
}
)+
};
}
/// Used for types that are `Copy` and which **do not care arena
/// allocated data** (i.e., don't need to be folded).
#[macro_export]
macro_rules! TrivialTypeTraversalImpls {
($($ty:ty),+ $(,)?) => {
$(
impl<'tcx> $crate::ty::fold::TypeFoldable<$crate::ty::TyCtxt<'tcx>> for $ty {
fn try_fold_with<F: $crate::ty::fold::FallibleTypeFolder<$crate::ty::TyCtxt<'tcx>>>(
self,
_: &mut F,
) -> ::std::result::Result<Self, F::Error> {
Ok(self)
}
#[inline]
fn fold_with<F: $crate::ty::fold::TypeFolder<$crate::ty::TyCtxt<'tcx>>>(
self,
_: &mut F,
) -> Self {
self
}
}
impl<'tcx> $crate::ty::visit::TypeVisitable<$crate::ty::TyCtxt<'tcx>> for $ty {
#[inline]
fn visit_with<F: $crate::ty::visit::TypeVisitor<$crate::ty::TyCtxt<'tcx>>>(
&self,
_: &mut F)
-> ::std::ops::ControlFlow<F::BreakTy>
{
::std::ops::ControlFlow::Continue(())
}
}
)+
};
}
#[macro_export]
macro_rules! TrivialTypeTraversalAndLiftImpls {
($($t:tt)*) => {
TrivialTypeTraversalImpls! { $($t)* }
CloneLiftImpls! { $($t)* }
}
}
|
