Enum pubgrub::error::PubGrubError

pub enum PubGrubError<P: Package, V: Version> {
    NoSolution(DerivationTree<P, V>),
    ErrorRetrievingDependencies {
        package: P,
        version: V,
        source: Box<dyn Error>,
    },
    DependencyOnTheEmptySet {
        package: P,
        version: V,
        dependent: P,
    },
    SelfDependency {
        package: P,
        version: V,
    },
    ErrorChoosingPackageVersion(Box<dyn Error>),
    ErrorInShouldCancel(Box<dyn Error>),
    Failure(String),
}

Errors that may occur while solving dependencies.

Variants

NoSolution(DerivationTree<P, V>)

There is no solution for this set of dependencies.

ErrorRetrievingDependencies

Error arising when the implementer of DependencyProvider returned an error in the method get_dependencies.

Fields of ErrorRetrievingDependencies

package: P

Package whose dependencies we want.

version: V

Version of the package for which we want the dependencies.

source: Box<dyn Error>

Error raised by the implementer of DependencyProvider.

DependencyOnTheEmptySet

Error arising when the implementer of DependencyProvider returned a dependency on an empty range. This technically means that the package can not be selected, but is clearly some kind of mistake.

Fields of DependencyOnTheEmptySet

package: P

Package whose dependencies we want.

version: V

Version of the package for which we want the dependencies.

dependent: P

The dependent package that requires us to pick from the empty set.

SelfDependency

Error arising when the implementer of DependencyProvider returned a dependency on the requested package. This technically means that the package directly depends on itself, and is clearly some kind of mistake.

Fields of SelfDependency

package: P

Package whose dependencies we want.

version: V

Version of the package for which we want the dependencies.

ErrorChoosingPackageVersion(Box<dyn Error>)

Error arising when the implementer of DependencyProvider returned an error in the method choose_package_version.

ErrorInShouldCancel(Box<dyn Error>)

Error arising when the implementer of DependencyProvider returned an error in the method should_cancel.

Failure(String)

Something unexpected happened.

Trait Implementations

impl<P: Debug + Package, V: Debug + Version> Debug for PubGrubError<P, V>

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

Formats the value using the given formatter.

impl<P: Package, V: Version> Display for PubGrubError<P, V>

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

Formats the value using the given formatter.

impl<P: Package, V: Version> Error for PubGrubError<P, V>

pub fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any.

pub fn backtrace(&self) -> Option<&Backtrace>

🔬 This is a nightly-only experimental API. (backtrace)

Returns a stack backtrace, if available, of where this error occurred.

pub fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

pub fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting