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§
source§impl Clone for Transparency
impl Clone for Transparency
source§fn clone(&self) -> Transparency
fn clone(&self) -> Transparency
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Transparency
impl Debug for Transparency
source§impl<__D: Decoder> Decodable<__D> for Transparency
impl<__D: Decoder> Decodable<__D> for Transparency
source§impl<__E: Encoder> Encodable<__E> for Transparency
impl<__E: Encoder> Encodable<__E> for Transparency
source§impl Hash for Transparency
impl Hash for Transparency
source§impl<__CTX> HashStable<__CTX> for Transparencywhere
__CTX: HashStableContext,
impl<__CTX> HashStable<__CTX> for Transparencywhere
__CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
source§impl PartialEq<Transparency> for Transparency
impl PartialEq<Transparency> for Transparency
source§fn eq(&self, other: &Transparency) -> bool
fn eq(&self, other: &Transparency) -> bool
source§impl PartialOrd<Transparency> for Transparency
impl PartialOrd<Transparency> for Transparency
source§fn partial_cmp(&self, other: &Transparency) -> Option<Ordering>
fn partial_cmp(&self, other: &Transparency) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl 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§
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