cargo-test.log

$ cargo test

   Compiling hello v0.1.0 (file:///home/cfcosta/Projects/hello)
error: internal compiler error: Error constructed but not emitted

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at 'explicit panic', /checkout/src/librustc_errors/diagnostic_builder.rs:204
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
             at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at /checkout/src/libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at /checkout/src/libstd/sys_common/backtrace.rs:60
             at /checkout/src/libstd/panicking.rs:355
   3: std::panicking::default_hook
             at /checkout/src/libstd/panicking.rs:365
   4: std::panicking::rust_panic_with_hook
             at /checkout/src/libstd/panicking.rs:549
   5: std::panicking::begin_panic
   6: <rustc_errors::diagnostic_builder::DiagnosticBuilder<'a> as core::ops::Drop>::drop
   7: core::ptr::drop_in_place
             at /checkout/src/libcore/ptr.rs:60
   8: core::ptr::drop_in_place
             at /checkout/src/libcore/ptr.rs:60
   9: <core::result::Result<T, E>>::ok
             at /checkout/src/libcore/result.rs:342
  10: <stainless::describe::DescribeState as stainless::parse::Parse<(syntax_pos::Span, &'a mut syntax::ext::base::ExtCtxt<'b>, core::option::Option<syntax_pos::symbol::Ident>)>>::parse
             at /home/cfcosta/.cargo/registry/src/github.com-1ecc6299db9ec823/stainless-0.1.11/src/parse.rs:143
  11: stainless::describe::describe
             at /home/cfcosta/.cargo/registry/src/github.com-1ecc6299db9ec823/stainless-0.1.11/src/describe.rs:68
  12: core::ops::Fn::call
             at /checkout/src/libcore/ops.rs:2588
  13: <F as syntax::ext::base::IdentMacroExpander>::expand
             at /checkout/src/libsyntax/ext/base.rs:260
  14: syntax::ext::expand::MacroExpander::expand_bang_invoc
  15: syntax::ext::expand::MacroExpander::expand
  16: syntax::ext::expand::MacroExpander::expand_crate
  17: rustc_driver::driver::phase_2_configure_and_expand::{{closure}}
  18: rustc_driver::driver::phase_2_configure_and_expand
  19: rustc_driver::driver::compile_input
  20: rustc_driver::run_compiler

error: Could not compile `hello`.

To learn more, run the command again with --verbose.

Cargo.toml

[package]
name = "hello"
version = "0.1.0"
authors = ["Cainã Costa <[email protected]>"]

[dependencies]
rocket = { version = "*", features = ["testing"] }
rocket_codegen = "*"

[dev-dependencies]
stainless = "*"

main.rs

#![feature(plugin)]
#![plugin(rocket_codegen)]
#![cfg_attr(test, plugin(stainless))]

extern crate rocket;

pub mod routes {
    #[get("/health")]
    pub fn health() -> String {
        String::from("OK")
    }
}

#[cfg(test)]
#[allow(unused_variables)]
mod tests {
    use rocket;
    use rocket::testing::MockRequest;
    use rocket::http::{Status, Method};

    use routes;

    describe! status {
        before_each {
            let rocket = rocket::ignite().mount("/", routes![routes::health])
            let mut request = MockRequest::new(Method::Get, "/health");
            let mut response = request.dispatch_with(&rocket);
            let body = res.body().and_then(|b| b.into_string()).unwrap();
        }

        it "responds with 200 OK" {
            assert_eq!(res.status(), Status::Ok);
        }
    }
}

fn main() {
    rocket::ignite()
        .mount("/", routes![routes::health])
        .launch();
}