Trait ResultExt

pub trait ResultExt<T, E>: Sized {
    // Required methods
    fn context_with<C: ToTokensError + 'static>(
        self,
        error: impl FnOnce() -> C,
    ) -> Result<T, Error>;
    fn attachment(self, label: &'static str, msg: impl Display) -> Self
       where E: Attachment;

    // Provided methods
    fn context(self, error: impl ToTokensError + 'static) -> Result<T, Error> { ... }
    fn error(self, msg: impl Display) -> Self
       where E: Attachment { ... }
    fn warning(self, msg: impl Display) -> Self
       where E: Attachment { ... }
    fn note(self, msg: impl Display) -> Self
       where E: Attachment { ... }
    fn help(self, msg: impl Display) -> Self
       where E: Attachment { ... }
}

Some utilities on Result<T, impl ToTokensError>

Required Methods

fn context_with<C: ToTokensError + 'static>( self, error: impl FnOnce() -> C, ) -> Result<T, Error>

If self is error, attaches another error, closure is only executed if the Result is Err

fn attachment(self, label: &'static str, msg: impl Display) -> Self

where E: Attachment,

If self is error, extend error message

Only works if E implements Attachment which is the case for ErrorMessage

Provided Methods

fn context(self, error: impl ToTokensError + 'static) -> Result<T, Error>

If self is error, attaches another error

fn error(self, msg: impl Display) -> Self

where E: Attachment,

Attaches a new error message to self reusing the same span

fn warning(self, msg: impl Display) -> Self

where E: Attachment,

Attaches a new warning message to self reusing the same span

fn note(self, msg: impl Display) -> Self

where E: Attachment,

Attaches a new note message to self reusing the same span

fn help(self, msg: impl Display) -> Self

where E: Attachment,

Attaches a new help message to self reusing the same span

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<T, E: ToTokensError + 'static> ResultExt<T, E> for Result<T, E>