Enum rustc_span::hygiene::Transparency
source · [−]pub enum Transparency {
Transparent,
SemiTransparent,
Opaque,
}
Expand description
A property of a macro expansion that determines how identifiers produced by that expansion are resolved.
Variants
Transparent
Identifier produced by a transparent expansion is always resolved at call-site.
Call-site spans in procedural macros, hygiene opt-out in macro
should use this.
SemiTransparent
Identifier produced by a semi-transparent expansion may be resolved
either at call-site or at definition-site.
If it’s a local variable, label or $crate
then it’s resolved at def-site.
Otherwise it’s resolved at call-site.
macro_rules
macros behave like this, built-in macros currently behave like this too,
but that’s an implementation detail.
Opaque
Identifier produced by an opaque expansion is always resolved at definition-site.
Def-site spans in procedural macros, identifiers from macro
by default use this.
Trait Implementations
sourceimpl Clone for Transparency
impl Clone for Transparency
sourcefn clone(&self) -> Transparency
fn clone(&self) -> Transparency
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for Transparency
impl Debug for Transparency
sourceimpl<__D: Decoder> Decodable<__D> for Transparency
impl<__D: Decoder> Decodable<__D> for Transparency
sourceimpl<__E: Encoder> Encodable<__E> for Transparency
impl<__E: Encoder> Encodable<__E> for Transparency
sourceimpl Hash for Transparency
impl Hash for Transparency
sourceimpl<__CTX> HashStable<__CTX> for Transparency where
__CTX: HashStableContext,
impl<__CTX> HashStable<__CTX> for Transparency where
__CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
sourceimpl PartialEq<Transparency> for Transparency
impl PartialEq<Transparency> for Transparency
sourceimpl PartialOrd<Transparency> for Transparency
impl PartialOrd<Transparency> for Transparency
sourcefn partial_cmp(&self, other: &Transparency) -> Option<Ordering>
fn partial_cmp(&self, other: &Transparency) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
1.0.0 · sourcefn lt(&self, other: &Rhs) -> bool
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
1.0.0 · sourcefn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
impl Copy for Transparency
impl Eq for Transparency
impl StructuralEq for Transparency
impl StructuralPartialEq for Transparency
Auto Trait Implementations
impl RefUnwindSafe for Transparency
impl Send for Transparency
impl Sync for Transparency
impl Unpin for Transparency
impl UnwindSafe for Transparency
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more
Layout
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.
Size: 1 byte
Size for each variant:
Transparent
: 0 bytesSemiTransparent
: 0 bytesOpaque
: 0 bytes