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Allow repr attribute on single variant enum.

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This commit is contained in:
Luqman Aden 2016-05-13 12:30:44 -04:00
parent a581c82bdc
commit f3e1d57bc2
2 changed files with 19 additions and 3 deletions
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4
src/librustc_trans/adt.rs
View File

@ -306,10 +306,8 @@ fn represent_type_uncached<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
cx.tcx().item_path_str(def.did));
}
if cases.len() == 1 {
if cases.len() == 1 && hint == attr::ReprAny {
// Equivalent to a struct/tuple/newtype.
// (Typechecking will reject discriminant-sizing attrs.)
assert_eq!(hint, attr::ReprAny);
let mut ftys = cases[0].tys.clone();
if dtor { ftys.push(cx.tcx().dtor_type()); }
return Univariant(mk_struct(cx, &ftys[..], false, t),

18
src/test/run-pass/issue-33202.rs Normal file
View File

@ -0,0 +1,18 @@
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.
#[repr(C)]
pub enum CPOption<T> {
PSome(T),
}
fn main() {
println!("sizeof CPOption<i32> {}", std::mem::size_of::<CPOption<i32>>());
}