mirror of
https://github.com/clap-rs/clap
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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>,
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// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and
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// Andrew Hobden (@hoverbear) <andrew@hoverbear.org>
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//
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// This work was derived from Structopt (https://github.com/TeXitoi/structopt)
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// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the
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// MIT/Apache 2.0 license.
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use clap::Clap;
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// Tests that clap_derive properly detects an `Option` field
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// that results from a macro expansion
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#[test]
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fn use_option() {
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macro_rules! expand_ty {
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($name:ident: $ty:ty) => {
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#[derive(Clap)]
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struct Outer {
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#[clap(short, long)]
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#[allow(dead_code)]
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$name: $ty,
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}
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};
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}
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expand_ty!(my_field: Option<String>);
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}
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