Method context

crates/core/src/error/error.rs:740–752

Add additional context to this error. The new context will show up first in the error chain, and the original error will come next. This is similar to the [`Context::context`] trait method, but because it is a method directly on [`Error`], there is no need for lazily-computing the error context (like `with_context` does). Calling [`error.is:: ()`](Error::is) will return `true` for the new err

(self, context: C)

    /// );
    /// ```
    pub fn context<C>(self, context: C) -> Self
    where
        C: fmt::Display + Send + Sync + 'static,
    {
        if self.inner.is_oom() {
            self
        } else {
            Self::from_error_ext(ContextError {
                context,
                error: Some(self),
            })
        }
    }

    #[inline]
    pub(crate) fn from_error_ext(error: impl ErrorExt) -> Self {