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Auto merge of #5177 - matthewjasper:own-infer, r=flip1995

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Avoid using regions from `TypeckTables`

These regions will all be `ReErased` soon. (rust-lang/rust#69189)

changelog: none
This commit is contained in:
bors 2020-02-15 16:47:06 +00:00
commit 578960d61d
2 changed files with 39 additions and 4 deletions
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39
clippy_lints/src/methods/mod.rs
View file

@ -1721,14 +1721,49 @@ fn lint_expect_fun_call(
if match_type(cx, arg_ty, &paths::STRING) {
return false;
}
if let ty::Ref(ty::ReStatic, ty, ..) = arg_ty.kind {
if ty.kind == ty::Str {
if let ty::Ref(_, ty, ..) = arg_ty.kind {
if ty.kind == ty::Str && can_be_static_str(cx, arg) {
return false;
}
};
true
}
// Check if an expression could have type `&'static str`, knowing that it
// has type `&str` for some lifetime.
fn can_be_static_str(cx: &LateContext<'_, '_>, arg: &hir::Expr<'_>) -> bool {
match arg.kind {
hir::ExprKind::Lit(_) => true,
hir::ExprKind::Call(fun, _) => {
if let hir::ExprKind::Path(ref p) = fun.kind {
match cx.tables.qpath_res(p, fun.hir_id) {
hir::def::Res::Def(hir::def::DefKind::Fn, def_id)
| hir::def::Res::Def(hir::def::DefKind::Method, def_id) => matches!(
cx.tcx.fn_sig(def_id).output().skip_binder().kind,
ty::Ref(ty::ReStatic, ..)
),
_ => false,
}
} else {
false
}
},
hir::ExprKind::MethodCall(..) => cx.tables.type_dependent_def_id(arg.hir_id).map_or(false, |method_id| {
matches!(
cx.tcx.fn_sig(method_id).output().skip_binder().kind,
ty::Ref(ty::ReStatic, ..)
)
}),
hir::ExprKind::Path(ref p) => match cx.tables.qpath_res(p, arg.hir_id) {
hir::def::Res::Def(hir::def::DefKind::Const, _) | hir::def::Res::Def(hir::def::DefKind::Static, _) => {
true
},
_ => false,
},
_ => false,
}
}
fn generate_format_arg_snippet(
cx: &LateContext<'_, '_>,
a: &hir::Expr<'_>,

4
clippy_lints/src/needless_pass_by_value.rs
View file

@ -7,7 +7,7 @@ use if_chain::if_chain;
use matches::matches;
use rustc::traits;
use rustc::traits::misc::can_type_implement_copy;
use rustc::ty::{self, RegionKind, TypeFoldable};
use rustc::ty::{self, TypeFoldable};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_errors::{Applicability, DiagnosticBuilder};
use rustc_hir::intravisit::FnKind;
@ -171,7 +171,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
(
preds.iter().any(|t| t.def_id() == borrow_trait),
!preds.is_empty() && {
let ty_empty_region = cx.tcx.mk_imm_ref(&RegionKind::ReEmpty(ty::UniverseIndex::ROOT), ty);
let ty_empty_region = cx.tcx.mk_imm_ref(cx.tcx.lifetimes.re_root_empty, ty);
preds.iter().all(|t| {
let ty_params = &t
.skip_binder()