pub struct Empty;
Expand description
Always parses succesfully, consuming no tokens. Emits nothing when printed.
This type exists because
syn::parse::Nothing
doesn’t implement ToTokens
.
Implementations
Trait Implementations
sourceimpl Ord for Empty
impl Ord for Empty
1.21.0 · sourcefn max(self, other: Self) -> Self
fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
1.21.0 · sourcefn min(self, other: Self) -> Self
fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
1.50.0 · sourcefn clamp(self, min: Self, max: Self) -> Selfwhere
Self: PartialOrd<Self>,
fn clamp(self, min: Self, max: Self) -> Selfwhere
Self: PartialOrd<Self>,
Restrict a value to a certain interval. Read more
sourceimpl PartialOrd<Empty> for Empty
impl PartialOrd<Empty> for Empty
sourcefn partial_cmp(&self, other: &Empty) -> Option<Ordering>
fn partial_cmp(&self, other: &Empty) -> Option<Ordering>
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 moresourceimpl ToTokens for Empty
impl ToTokens for Empty
sourcefn to_tokens(&self, _tokens: &mut TokenStream)
fn to_tokens(&self, _tokens: &mut TokenStream)
sourcefn to_token_stream(&self) -> TokenStream
fn to_token_stream(&self) -> TokenStream
sourcefn into_token_stream(self) -> TokenStream
fn into_token_stream(self) -> TokenStream
impl Copy for Empty
impl Eq for Empty
impl StructuralEq for Empty
impl StructuralPartialEq for Empty
Auto Trait Implementations
impl RefUnwindSafe for Empty
impl Send for Empty
impl Sync for Empty
impl Unpin for Empty
impl UnwindSafe for Empty
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
sourceimpl<T> Spanned for Twhere
T: Spanned + ?Sized,
impl<T> Spanned for Twhere
T: Spanned + ?Sized,
sourcefn span(&self) -> Span
fn span(&self) -> Span
Returns a
Span
covering the complete contents of this syntax tree
node, or Span::call_site()
if this node is empty. Read moresourceimpl<T> SpannedExt for Twhere
T: Spanned + ?Sized,
impl<T> SpannedExt for Twhere
T: Spanned + ?Sized,
sourcefn byte_range(&self, source: &str) -> Range<usize>
fn byte_range(&self, source: &str) -> Range<usize>
TODO(H2CO3): a faster, less naive implementation would be great.
We should use the byte offset of start
to compute that of end
,
sparing the double scan of the source up until the start location.
let source = r#"
-3.667
1248 "string ű literal"
"wíőzs"
"#;
let tokens: Many<Lit> = source.parse()?;
assert_eq!(tokens.len(), 4);
assert_eq!(tokens[0].byte_range(source), 4..10);
assert_eq!(tokens[1].byte_range(source), 13..17);
assert_eq!(tokens[2].byte_range(source), 19..38);
assert_eq!(tokens[3].byte_range(source), 45..54);
sourcefn char_range(&self, source: &str) -> Range<usize>
fn char_range(&self, source: &str) -> Range<usize>
TODO(H2CO3): a faster, less naive implementation would be great.
We should use the char offset of start
to compute that of end
,
sparing the double scan of the source up until the start location.
let source = r#"
-3.667
1248 "string ű literal"
"wíőzs"
"#;
let tokens: Many<Lit> = source.parse()?;
assert_eq!(tokens.len(), 4);
assert_eq!(tokens[0].char_range(source), 4..10);
assert_eq!(tokens[1].char_range(source), 13..17);
assert_eq!(tokens[2].char_range(source), 19..37);
assert_eq!(tokens[3].char_range(source), 44..51);