pub struct Expr {
pub id: NodeId,
pub kind: ExprKind,
pub span: Span,
pub attrs: AttrVec,
pub tokens: Option<LazyAttrTokenStream>,
}
Expand description
An expression.
Fields
id: NodeId
kind: ExprKind
span: Span
attrs: AttrVec
tokens: Option<LazyAttrTokenStream>
Implementations
sourceimpl Expr
impl Expr
sourcepub fn returns(&self) -> bool
pub fn returns(&self) -> bool
Returns true
if this expression would be valid somewhere that expects a value;
for example, an if
condition.
sourcepub fn is_potential_trivial_const_param(&self) -> bool
pub fn is_potential_trivial_const_param(&self) -> bool
Is this expr either N
, or { N }
.
If this is not the case, name resolution does not resolve N
when using
min_const_generics
as more complex expressions are not supported.
pub fn to_bound(&self) -> Option<GenericBound>
pub fn peel_parens(&self) -> &Expr
pub fn precedence(&self) -> ExprPrecedence
pub fn take(&mut self) -> Self
pub fn is_approximately_pattern(&self) -> bool
Trait Implementations
sourceimpl DummyAstNode for Expr
impl DummyAstNode for Expr
sourceimpl HasAttrs for Expr
impl HasAttrs for Expr
sourceconst SUPPORTS_CUSTOM_INNER_ATTRS: bool = false
const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false
This is
true
if this HasAttrs
might support ‘custom’ (proc-macro) inner
attributes. Attributes like #![cfg]
and #![cfg_attr]
are not
considered ‘custom’ attributes. Read morefn attrs(&self) -> &[Attribute]
fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))
sourceimpl HasTokens for Expr
impl HasTokens for Expr
fn tokens(&self) -> Option<&LazyAttrTokenStream>
fn tokens_mut(&mut self) -> Option<&mut Option<LazyAttrTokenStream>>
Auto Trait Implementations
impl !RefUnwindSafe for Expr
impl !Send for Expr
impl !Sync for Expr
impl Unpin for Expr
impl !UnwindSafe for Expr
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
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
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: 104 bytes