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Permit uninhabited enums to cast into ints

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This essentially reverts part of #6204.
This commit is contained in:
Mark Rousskov 2020-09-01 09:49:40 -04:00
parent e88e908e66
commit e023158145
3 changed files with 6 additions and 11 deletions
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4
compiler/rustc_middle/src/ty/mod.rs
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@ -2481,8 +2481,10 @@ impl<'tcx> AdtDef {
self.variants.iter().flat_map(|v| v.fields.iter())
}
/// Whether the ADT lacks fields. Note that this includes uninhabited enums,
/// e.g., `enum Void {}` is considered payload free as well.
pub fn is_payloadfree(&self) -> bool {
!self.variants.is_empty() && self.variants.iter().all(|v| v.fields.is_empty())
self.variants.iter().all(|v| v.fields.is_empty())
}
/// Return a `VariantDef` given a variant id.