no-std example?

[buzmeg]

Is there an example of how to use snafu with no-std? The compiler is complaining that it can't find a "fail" method and I don't really understand why.

Thanks.

#![no_std]

use snafu::{ensure, Snafu};

pub type Result<T, E = Error> = core::result::Result<T, E>;

#[derive(Debug, Snafu)]
pub enum Error {
    OOMError,
}


fn foofn() -> Result<u32, Error>
{
    ensure!(1 < 0, Error::OOMError);

    Err(Error::OOMError)
}

results in:

error[E0599]: no method named `fail` found for enum `Error` in the current scope
  --> src/lib.rs:16:5
   |
9  | pub enum Error {
   | -------------- method `fail` not found for this
...
16 |     ensure!(1 < 0, Error::OOMError);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `Error`
   |
   = note: this error originates in the macro `ensure` (in Nightly builds, run with -Z macro-backtrace for more info)

[Enet4]

Is the std feature flag disabled?

[dependencies.snafu]
version = "0.6.0"
no-default-features = true
features = ["rust_1_46"]

[buzmeg]

Well, I certainly tried to disable it:

[dependencies]
snafu = { version = "0.7.0-beta.2", features = ["rust_1_46"], default-features = false }

[shepmaster]

    ensure!(1 < 0, Error::OOMError);

You are running into the number one problem with SNAFU — crossing the context selectors and the enum variants. This line needs to be

    ensure!(1 < 0, OOMError); // SNAFU 0.6

I'd encourage you to give version 0.7.0-beta.2 a try. In 0.7, the context selectors will have a Snafu suffix by default, making this much more obvious:

    ensure!(1 < 0, OOMSnafu); // SNAFU 0.7

[shepmaster]

Oh, you are using 0.7 — that's good! Please let me know how I can improve the documentation to help avoid this problem as this specific problem is a major focus of this release.