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derive: assume enum repr defaults to isize

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It was originally intended to be i32, but it isn't.

Fixes #31886.
This commit is contained in:
Alex Burka 2016-03-03 14:55:24 -05:00
parent 235d77457d
commit ee4b607dfb
2 changed files with 11 additions and 1 deletions
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2
src/libsyntax_ext/deriving/generic/mod.rs
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@ -758,7 +758,7 @@ impl<'a> TraitDef<'a> {
fn find_repr_type_name(diagnostic: &Handler,
type_attrs: &[ast::Attribute]) -> &'static str {
let mut repr_type_name = "i32";
let mut repr_type_name = "isize";
for a in type_attrs {
for r in &attr::find_repr_attrs(diagnostic, a) {
repr_type_name = match *r {

10
src/test/run-pass/enum-discrim-autosizing.rs
View File

@ -47,6 +47,12 @@ enum Ei64 {
Bi64 = 0x8000_0000
}
#[derive(PartialEq)]
enum Eu64 {
Au64 = 0,
Bu64 = 0x8000_0000_0000_0000
}
pub fn main() {
assert_eq!(size_of::<Ei8>(), 1);
assert_eq!(size_of::<Eu8>(), 1);
@ -58,4 +64,8 @@ pub fn main() {
assert_eq!(size_of::<Ei64>(), 8);
#[cfg(target_pointer_width = "32")]
assert_eq!(size_of::<Ei64>(), 4);
assert_eq!(size_of::<Eu64>(), 8);
// ensure no i32 collisions
assert!(Eu64::Au64 != Eu64::Bu64);
}