mirror of
https://github.com/clap-rs/clap
synced 2024-12-13 22:32:33 +00:00
c837b28552
Due to macro expansions, a `syn` type may be wrapped in multiple 'layers' of `syn::Type::Group`. However, `clap_derive` currently does not check for `syn::Type::Group`, which will cause an `Option` (along with other matched types) to fail to be detected when it results from a macro expansion. This commit 'unwraps' outer type groups before checking the user-provided types against well-known types. Currently, these groups may not be present due to a rustc bug (rust-lang/rust#43081) However, once https://github.com/rust-lang/rust/pull/73084 is merged, these groups will be present in more cases. This commit makes `clap` compatible with both older and newer versions of rustc.
33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>,
|
|
// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and
|
|
// Andrew Hobden (@hoverbear) <andrew@hoverbear.org>
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
//
|
|
// This work was derived from Structopt (https://github.com/TeXitoi/structopt)
|
|
// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the
|
|
// MIT/Apache 2.0 license.
|
|
|
|
use clap::Clap;
|
|
|
|
// Tests that clap_derive properly detects an `Option` field
|
|
// that results from a macro expansion
|
|
#[test]
|
|
fn use_option() {
|
|
macro_rules! expand_ty {
|
|
($name:ident: $ty:ty) => {
|
|
#[derive(Clap)]
|
|
struct Outer {
|
|
#[clap(short, long)]
|
|
#[allow(dead_code)]
|
|
$name: $ty,
|
|
}
|
|
};
|
|
}
|
|
|
|
expand_ty!(my_field: Option<String>);
|
|
}
|