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

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

Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.