Enum Definition 

pub enum Definition {
    Declared,
    Tentative,
    Defined,
}

How much of a definition a declaration is.

The three states are what the one-definition rules are written in terms of, and keeping them apart is what makes a tentative definition become a definition at the end of the translation unit rather than at the point it was read.

Variants

Declared

A declaration and nothing more, which is what extern int x; is and what every function declaration without a body is.

Tentative

A file-scope object with no initializer and no extern, which is a definition only if nothing else in the translation unit defines it. C calls this a tentative definition and it is the reason int x; int x; is one object and not an error.

Defined

A definition: an object with an initializer, a block-scope object with automatic storage, or a function with a body.

Trait Implementations

impl Clone for Definition

fn clone(&self) -> Definition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Definition

impl Debug for Definition

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

Formats the value using the given formatter.

impl Eq for Definition

impl PartialEq for Definition

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Definition