error[E0425]: cannot find value app in this scope #424
Description
I have the following code:
use structopt::StructOpt;
macro_rules! Command {
( $name:ident, [
#[$meta:meta] $var:ident($inner:ty)
] ) => {
#[derive(Debug, PartialEq, structopt::StructOpt)]
enum $name {
#[$meta] $var($inner),
}
};
}
Command! {GitCmd, [
#[structopt(external_subcommand)]
Ext(Vec<String>)
]}
// Works:
//#[derive(Debug, PartialEq, StructOpt)]
//enum GitCmd {
// #[structopt(external_subcommand)]
// Ext(Vec<String>),
//}
fn main() {
assert_eq!(
GitCmd::from_iter(&["test", "git", "status"]),
GitCmd::Ext(vec!["git".to_string(), "status".to_string()]),
);
}And it fails to compile (0.3.16, default features):
error[E0425]: cannot find value `app` in this scope
--> src/main.rs:7:32
|
7 | #[derive(Debug, PartialEq, structopt::StructOpt)]
| ^^^^^^^^^^^^^^^^^^^^ not found in this scope
error: aborting due to previous error
For more information about this error, try `rustc --explain E0425`.
error: could not compile `foo`.
To learn more, run the command again with --verbose.
I checked the expanded output and everything seems perfectly fine.
So then I came up with the following patch to structopt-derive:
--- lib.rs
+++ lib.rs
@@ -481,7 +481,7 @@ fn gen_augment_clap_enum(
let kind = attrs.kind();
match &*kind {
Kind::ExternalSubcommand => {
- quote_spanned! { attrs.kind().span()=>
+ quote! {
let app = app.setting(
::structopt::clap::AppSettings::AllowExternalSubcommands
);And now everything works. I am not really sure what to make of that. I checked the quote_spanned macro but nothing stood out. Any ideas?