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Rollup merge of #108484 - Nilstrieb:˂DiagnosticItem˂FromFn˃ as From˂˂LangItemFromFn˃˃˃꞉꞉from, r=cjgillot

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Remove `from` lang item

It was probably a leftover from the old `?` desugaring but anyways, it's unused now except for clippy, which can just use a diagnostics item.
This commit is contained in:
Matthias Krüger 2023-02-26 12:05:01 +01:00 committed by GitHub
commit 2e2e45a5ba
3 changed files with 6 additions and 5 deletions
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6
clippy_lints/src/operators/cmp_owned.rs
View file

@ -49,10 +49,10 @@ fn check_op(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>, left: bool)
(arg, arg.span)
},
ExprKind::Call(path, [arg])
if path_def_id(cx, path).map_or(false, |id| {
if match_def_path(cx, id, &paths::FROM_STR_METHOD) {
if path_def_id(cx, path).map_or(false, |did| {
if match_def_path(cx, did, &paths::FROM_STR_METHOD) {
true
} else if cx.tcx.lang_items().from_fn() == Some(id) {
} else if cx.tcx.is_diagnostic_item(sym::from_fn, did) {
!is_copy(cx, typeck.expr_ty(expr))
} else {
false

3
clippy_lints/src/unnecessary_owned_empty_strings.rs
View file

@ -7,6 +7,7 @@ use rustc_hir::{BorrowKind, Expr, ExprKind, LangItem, Mutability};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty;
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::symbol::sym;
declare_clippy_lint! {
/// ### What it does
@ -54,7 +55,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryOwnedEmptyStrings {
);
} else {
if_chain! {
if Some(fun_def_id) == cx.tcx.lang_items().from_fn();
if cx.tcx.is_diagnostic_item(sym::from_fn, fun_def_id);
if let [.., last_arg] = args;
if let ExprKind::Lit(spanned) = &last_arg.kind;
if let LitKind::Str(symbol, _) = spanned.node;

2
clippy_lints/src/useless_conversion.rs
View file

@ -161,7 +161,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
}
if_chain! {
if Some(def_id) == cx.tcx.lang_items().from_fn();
if cx.tcx.is_diagnostic_item(sym::from_fn, def_id);
if same_type_and_consts(a, b);
then {