Enum cfg_expr::error::Reason

pub enum Reason {
    InvalidNot(usize),
    InvalidCharacters,
    UnclosedParens,
    UnopenedParens,
    UnclosedQuotes,
    UnopenedQuotes,
    Empty,
    Unexpected(&'static [&'static str]),
    InvalidInteger,
    MultipleRootPredicates,
    InvalidHasAtomic,
    UnknownBuiltin,
}

The particular reason for a ParseError

Variants

InvalidNot(usize)

not() takes exactly 1 predicate, unlike all() and any()

InvalidCharacters

The characters are not valid in an cfg expression

UnclosedParens

An opening parens was unmatched with a closing parens

UnopenedParens

A closing parens was unmatched with an opening parens

UnclosedQuotes

An opening quotes was unmatched with a closing quotes

UnopenedQuotes

A closing quotes was unmatched with an opening quotes

Empty

The expression does not contain any valid terms

Unexpected(&'static [&'static str])

Found an unexpected term, which wasn’t one of the expected terms that is listed

InvalidInteger

Failed to parse an integer value

MultipleRootPredicates

The root cfg() may only contain a single predicate

InvalidHasAtomic

A target_has_atomic predicate didn’t correctly parse.

UnknownBuiltin

An element was not part of the builtin information in rustc

Trait Implementations

impl Debug for Reason

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

Formats the value using the given formatter.

impl Display for Reason

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

Formats the value using the given formatter.

impl PartialEq for Reason

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Reason

impl StructuralPartialEq for Reason