Unclear global variables usage (need examples)

[apiraino]

Consider this simple snippet:

use thunder;
use clap;
use thunder::thunderclap;
struct MyApp;
#[thunderclap(param: String: "A global var")]
impl MyApp {
    /// Scan a directory
    fn scan(source_dir: String) {
        println!("param={}", param);
    }
}
fn main() {
    MyApp::start();
}

returns an error when running compiling:

$ cargo run 
   Compiling test-thunder v0.1.0 (/home/xxx/tmp/test-thunder)
error[E0425]: cannot find value `param` in this scope
 --> src/main.rs:8:1
  |
8 | #[thunderclap(param: String: "A global var")]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope

or also

$ cargo run --param hey
error: Found argument '--param' which wasn't expected, or isn't valid in this context

USAGE:
    cargo run [OPTIONS] [--] [args]...

For more information try --help

How are global variable supposed to be used? Can you help with some more detailed examples?

thanks

[spacekookie]

Hey there!

Thanks for reporting this issue. I have to admit, I haven't used this code in a while but I'll try to have a look at what's going on here soon.

Also, just as general advice: if you want to run something via cargo and give it parameters, you need to escape them via -- first. So it would be: cargo run -- --param hey.

[apiraino]

yeah, I forgot to mention that I've also tried cargo run -- --param hey but same results