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Use pattern matching instead of checking lengths explicitly #85900

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Jun 3, 2021
Merged

Use pattern matching instead of checking lengths explicitly #85900

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26 changes: 7 additions & 19 deletions compiler/rustc_lint/src/types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,15 +5,14 @@ use rustc_data_structures::fx::FxHashSet;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_hir::{is_range_literal, ExprKind, Node};
use rustc_index::vec::Idx;
use rustc_middle::ty::layout::{IntegerExt, SizeSkeleton};
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, AdtKind, Ty, TyCtxt, TypeFoldable};
use rustc_span::source_map;
use rustc_span::symbol::sym;
use rustc_span::{Span, DUMMY_SP};
use rustc_target::abi::Abi;
use rustc_target::abi::{Integer, LayoutOf, TagEncoding, VariantIdx, Variants};
use rustc_target::abi::{Integer, LayoutOf, TagEncoding, Variants};
use rustc_target::spec::abi::Abi as SpecAbi;

use std::cmp;
Expand Down Expand Up @@ -783,25 +782,14 @@ crate fn repr_nullable_ptr<'tcx>(
) -> Option<Ty<'tcx>> {
debug!("is_repr_nullable_ptr(cx, ty = {:?})", ty);
if let ty::Adt(ty_def, substs) = ty.kind() {
if ty_def.variants.len() != 2 {
return None;
}

let get_variant_fields = |index| &ty_def.variants[VariantIdx::new(index)].fields;
let variant_fields = [get_variant_fields(0), get_variant_fields(1)];
let fields = if variant_fields[0].is_empty() {
&variant_fields[1]
} else if variant_fields[1].is_empty() {
&variant_fields[0]
} else {
return None;
let field_ty = match &ty_def.variants.raw[..] {
[var_one, var_two] => match (&var_one.fields[..], &var_two.fields[..]) {
([], [field]) | ([field], []) => field.ty(cx.tcx, substs),
_ => return None,
},
_ => return None,
};

if fields.len() != 1 {
return None;
}

let field_ty = fields[0].ty(cx.tcx, substs);
if !ty_is_known_nonnull(cx, field_ty, ckind) {
return None;
}
Expand Down