bjoernager/rust
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Reduce indentation by replacing match arm w/ early return.

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This commit is contained in:
jumbatm 2020-08-16 10:50:20 +10:00
parent 80c2c80d52
commit bca48ad7ac
1 changed files with 113 additions and 120 deletions
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29
src/librustc_lint/builtin.rs
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@ -2198,12 +2198,14 @@ impl ClashingExternDeclarations {
debug!("structurally_same_type_impl(cx, a = {:?}, b = {:?})", a, b);
match seen_types.get(a, b) {
// If we've already computed the result, just return the memoized result.
SeenSetResult::Computed(result) => result,
SeenSetResult::Computed(result) => return result,
// We are already in the process of computing structural sameness for this type,
// meaning we've found a cycle. The types are structurally same, then.
SeenSetResult::Computing => true,
// We haven't seen this combination of types at all -- compute their sameness.
SeenSetResult::Unseen => {
SeenSetResult::Computing => return true,
// We haven't seen this combination of types at all -- continue on to computing
// their sameness.
SeenSetResult::Unseen => (),
}
seen_types.mark_computing(a, b);
let tcx = cx.tcx;
let result = if a == b || rustc_middle::ty::TyS::same_type(a, b) {
@ -2223,9 +2225,8 @@ impl ClashingExternDeclarations {
};
#[allow(rustc::usage_of_ty_tykind)]
let is_primitive_or_pointer = |kind: &ty::TyKind<'_>| {
kind.is_primitive() || matches!(kind, RawPtr(..))
};
let is_primitive_or_pointer =
|kind: &ty::TyKind<'_>| kind.is_primitive() || matches!(kind, RawPtr(..));
match (a_kind, b_kind) {
(Adt(a_def, a_substs), Adt(b_def, b_substs)) => {
@ -2254,9 +2255,7 @@ impl ClashingExternDeclarations {
(Array(a_ty, a_const), Array(b_ty, b_const)) => {
// For arrays, we also check the constness of the type.
a_const.val == b_const.val
&& structurally_same_type_impl(
seen_types, cx, a_ty, b_ty, ckind,
)
&& structurally_same_type_impl(seen_types, cx, a_ty, b_ty, ckind)
}
(Slice(a_ty), Slice(b_ty)) => {
structurally_same_type_impl(seen_types, cx, a_ty, b_ty, ckind)
@ -2274,9 +2273,7 @@ impl ClashingExternDeclarations {
(Ref(_a_region, a_ty, a_mut), Ref(_b_region, b_ty, b_mut)) => {
// For structural sameness, we don't need the region to be same.
a_mut == b_mut
&& structurally_same_type_impl(
seen_types, cx, a_ty, b_ty, ckind,
)
&& structurally_same_type_impl(seen_types, cx, a_ty, b_ty, ckind)
}
(FnDef(..), FnDef(..)) => {
let a_poly_sig = a.fn_sig(tcx);
@ -2316,9 +2313,7 @@ impl ClashingExternDeclarations {
| (Opaque(..), Opaque(..)) => false,
// These definitely should have been caught above.
(Bool, Bool) | (Char, Char) | (Never, Never) | (Str, Str) => {
unreachable!()
}
(Bool, Bool) | (Char, Char) | (Never, Never) | (Str, Str) => unreachable!(),
// An Adt and a primitive type. This can be FFI-safe is the ADT is an enum with a
// non-null field.
@ -2342,8 +2337,6 @@ impl ClashingExternDeclarations {
seen_types.mark_computed(a, b, result);
result
}
}
}
let mut seen_types = SeenSet::new();
structurally_same_type_impl(&mut seen_types, cx, a, b, ckind)
}