bjoernager/rust
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Refactor: VariantIdx::from_u32(0) -> FIRST_VARIANT

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Since structs are always `VariantIdx(0)`, there's a bunch of files where the only reason they had `VariantIdx` or `vec::Idx` imported at all was to get the first variant.

So this uses a constant for that, and adds some doc-comments to `VariantIdx` while I'm there, since it doesn't have any today.
This commit is contained in:
Scott McMurray 2023-03-25 18:43:03 -07:00
parent 96bd50dd47
commit 0439d13176
25 changed files with 80 additions and 78 deletions
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4
compiler/rustc_mir_transform/src/inline.rs
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@ -10,7 +10,7 @@ use rustc_middle::mir::*;
use rustc_middle::ty::{self, Instance, InstanceDef, ParamEnv, Ty, TyCtxt};
use rustc_session::config::OptLevel;
use rustc_span::{hygiene::ExpnKind, ExpnData, LocalExpnId, Span};
use rustc_target::abi::VariantIdx;
use rustc_target::abi::FIRST_VARIANT;
use rustc_target::spec::abi::Abi;
use crate::simplify::{remove_dead_blocks, CfgSimplifier};
@ -911,7 +911,7 @@ impl<'tcx> Visitor<'tcx> for CostChecker<'_, 'tcx> {
check_equal(self, *f_ty);
}
ty::Adt(adt_def, substs) => {
let var = parent_ty.variant_index.unwrap_or(VariantIdx::from_u32(0));
let var = parent_ty.variant_index.unwrap_or(FIRST_VARIANT);
let Some(field) = adt_def.variant(var).fields.get(f.as_usize()) else {
self.validation = Err("malformed MIR");
return;