Struct FnModifiers 

#[non_exhaustive]
pub struct FnModifiers {
    pub defaultness: Option<Default>,
}

Available on crate feature full only.

Additional optional information about a function.

This data structure may grow to accommodate future Rust language changes, including the following in-progress RFCs:

• RFC 3513 “Generators” (gen fn)
• RFC 3678 “Trait method impl restrictions” (final fn)
• #128044 “Contracts”

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

defaultness: Option<Default>

Unstable syntax: RFC 1210 “Impl specialization”

Implementations

impl FnModifiers

pub fn require_empty(&self) -> Result<()>

Available on crate feature parsing only.

Trait Implementations

impl Clone for FnModifiers

Available on crate feature clone-impls only.

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FnModifiers

Available on crate feature extra-traits only.

fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for FnModifiers

fn default() -> Self

Returns the “default value” for a type.

impl Eq for FnModifiers

Available on crate feature extra-traits only.

impl Hash for FnModifiers

Available on crate feature extra-traits only.

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for FnModifiers

Available on crate feature extra-traits only.

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.