Enum BuildError 

#[non_exhaustive]
pub enum BuildError {
    Io(Error),
    Config(String),
    ToolMissing(String),
    Build(SourceError),
}

Why a build could not be configured or could not run.

The split is deliberate: Io and Config are reported while the crate::Builder is being assembled, before any file is touched, and ToolMissing before any tool is invoked. Only Build can arrive after work has started. A caller can therefore treat the first three as “you configured this wrong” and the last as “the build failed”, which are different problems for different people.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Io(Error)

A configured path could not be canonicalized — most often, it does not exist.

Config(String)

A path relationship the builder refuses: a source folder overlapping the output dir, two source folders overlapping each other, or a JS bundle entry outside every registered source folder.

ToolMissing(String)

A configured tool’s binary is not on PATH, discovered before any build work runs rather than partway through.

Build(SourceError)

A pipeline ran and failed.

Trait Implementations

impl Debug for BuildError

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

Formats the value using the given formatter.

impl Display for BuildError

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

Formats the value using the given formatter.

impl Error for BuildError

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

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

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

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl From<Error> for BuildError

fn from(e: Error) -> Self

Converts to this type from the input type.

impl From<SourceError> for BuildError

fn from(e: SourceError) -> Self

Converts to this type from the input type.