Enum cargo_rustc_cfg::Error

pub enum Error {
    Command(Output),
    FromUtf8(FromUtf8Error),
    Generic(String),
    Io(Error),
    MissingOutput(&'static str),
}

The error type for cargo-rustc-cfg operations and associated traits.

Errors mostly originate from the dependencies and executing the cargo rustc -- --print cfg command, i.e. Input/Output (IO) errors, but custom instances of Error can be created with the Generic variant and a message.

Variants

Command(Output)

A command operation failed. Any content in the STDERR stream is used as part of the error message.

FromUtf8(FromUtf8Error)

UTF-8 string conversion failed.

Generic(String)

A generic, or custom, error occurred. The message should contain the detailed information.

Io(Error)

An I/O operation failed.

MissingOutput(&'static str)

An expected output from the cargo rustc -- --print cfg command is missing.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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

impl From<&'static str> for Error

pub fn from(e: &str) -> Self

Performs the conversion.

impl From<Error> for Error

pub fn from(e: Error) -> Self

Performs the conversion.

impl From<FromUtf8Error> for Error

pub fn from(e: FromUtf8Error) -> Self

Performs the conversion.

impl From<String> for Error

pub fn from(e: String) -> Self

Performs the conversion.