Enum rustc_ap_rustc_parse::parser::PathStyle [−][src]
pub enum PathStyle { Expr, Type, Mod, }
Expand description
Specifies how to parse a path.
Variants
In some contexts, notably in expressions, paths with generic arguments are ambiguous
with something else. For example, in expressions segment < ....
can be interpreted
as a comparison and segment ( ....
can be interpreted as a function call.
In all such contexts the non-path interpretation is preferred by default for practical
reasons, but the path interpretation can be forced by the disambiguator ::
, e.g.
x<y>
- comparisons, x::<y>
- unambiguously a path.
In other contexts, notably in types, no ambiguity exists and paths can be written
without the disambiguator, e.g., x<y>
- unambiguously a path.
Paths with disambiguators are still accepted, x::<Y>
- unambiguously a path too.
A path with generic arguments disallowed, e.g., foo::bar::Baz
, used in imports,
visibilities or attributes.
Technically, this variant is unnecessary and e.g., Expr
can be used instead
(paths in “mod” contexts have to be checked later for absence of generic arguments
anyway, due to macros), but it is used to avoid weird suggestions about expected
tokens when something goes wrong.
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for PathStyle
impl UnwindSafe for PathStyle
Blanket Implementations
Mutably borrows from an owned value. Read more
Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
type Output = T
type Output = T
Should always be Self
pub fn vzip(self) -> V