Auto merge of rust-lang#13510 - alex-semenyuk:cleanup_const_float_classify, r=llogiq

Cleanup `const_float_classify`

As mentioned at rust-lang#13508 `const_float_classify` has been stabilized recently in rust-lang#130157 and can be cleanup

Close rust-lang#13508

changelog: [none]

Author: bors

clippy_config/src/msrvs.rs

@@ -17,8 +17,7 @@ macro_rules! msrv_aliases {
 
 // names may refer to stabilized feature flags or library items
 msrv_aliases! {
-    1,83,0 { CONST_EXTERN_FN }
-    1,83,0 { CONST_FLOAT_BITS_CONV }
+    1,83,0 { CONST_EXTERN_FN, CONST_FLOAT_BITS_CONV, CONST_FLOAT_CLASSIFY }
     1,82,0 { IS_NONE_OR }
     1,81,0 { LINT_REASONS_STABILIZATION }
     1,80,0 { BOX_INTO_ITER}

clippy_lints/src/lib.rs

@@ -903,7 +903,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
     store.register_late_pass(|_| Box::new(manual_range_patterns::ManualRangePatterns));
     store.register_early_pass(|| Box::new(visibility::Visibility));
     store.register_late_pass(move |_| Box::new(tuple_array_conversions::TupleArrayConversions::new(conf)));
-    store.register_late_pass(|_| Box::new(manual_float_methods::ManualFloatMethods));
+    store.register_late_pass(move |_| Box::new(manual_float_methods::ManualFloatMethods::new(conf)));
     store.register_late_pass(|_| Box::new(four_forward_slashes::FourForwardSlashes));
     store.register_late_pass(|_| Box::new(error_impl_error::ErrorImplError));
     store.register_late_pass(move |_| Box::new(absolute_paths::AbsolutePaths::new(conf)));

clippy_lints/src/manual_float_methods.rs

@@ -1,3 +1,5 @@
+use clippy_config::msrvs::Msrv;
+use clippy_config::{Conf, msrvs};
 use clippy_utils::consts::{ConstEvalCtxt, Constant};
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::SpanRangeExt;
@@ -6,7 +8,7 @@ use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, Constness, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass, Lint, LintContext};
 use rustc_middle::lint::in_external_macro;
-use rustc_session::declare_lint_pass;
+use rustc_session::impl_lint_pass;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -56,7 +58,7 @@ declare_clippy_lint! {
     style,
     "use dedicated method to check if a float is finite"
 }
-declare_lint_pass!(ManualFloatMethods => [MANUAL_IS_INFINITE, MANUAL_IS_FINITE]);
+impl_lint_pass!(ManualFloatMethods => [MANUAL_IS_INFINITE, MANUAL_IS_FINITE]);
 
 #[derive(Clone, Copy)]
 enum Variant {
@@ -80,6 +82,18 @@ impl Variant {
     }
 }
 
+pub struct ManualFloatMethods {
+    msrv: Msrv,
+}
+
+impl ManualFloatMethods {
+    pub fn new(conf: &'static Conf) -> Self {
+        Self {
+            msrv: conf.msrv.clone(),
+        }
+    }
+}
+
 impl<'tcx> LateLintPass<'tcx> for ManualFloatMethods {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         if let ExprKind::Binary(kind, lhs, rhs) = expr.kind
@@ -92,7 +106,7 @@ impl<'tcx> LateLintPass<'tcx> for ManualFloatMethods {
             && !in_external_macro(cx.sess(), expr.span)
             && (
                 matches!(cx.tcx.constness(cx.tcx.hir().enclosing_body_owner(expr.hir_id)), Constness::NotConst)
-                    || cx.tcx.features().declared(sym!(const_float_classify))
+                    || self.msrv.meets(msrvs::CONST_FLOAT_CLASSIFY)
             )
             && let [first, second, const_1, const_2] = exprs
             && let ecx = ConstEvalCtxt::new(cx)
@@ -150,6 +164,8 @@ impl<'tcx> LateLintPass<'tcx> for ManualFloatMethods {
             });
         }
     }
+
+    extract_msrv_attr!(LateContext);
 }
 
 fn is_infinity(constant: &Constant<'_>) -> bool {

tests/ui/manual_float_methods.rs

@@ -39,8 +39,11 @@ fn main() {
     if x != f64::INFINITY && x != fn_test() {}
     // Not -inf
     if x != f64::INFINITY && x != fn_test_not_inf() {}
+    const {
+        let x = 1.0f64;
+        if x == f64::INFINITY || x == f64::NEG_INFINITY {}
+    }
     const X: f64 = 1.0f64;
-    // Will be linted if `const_float_classify` is enabled
     if const { X == f64::INFINITY || X == f64::NEG_INFINITY } {}
     if const { X != f64::INFINITY && X != f64::NEG_INFINITY } {}
     external! {

tests/ui/manual_float_methods.stderr

@@ -78,5 +78,11 @@ help: or, for conciseness
 LL |     if !x.is_infinite() {}
    |        ~~~~~~~~~~~~~~~~
 
-error: aborting due to 6 previous errors
+error: manually checking if a float is infinite
+  --> tests/ui/manual_float_methods.rs:44:12
+   |
+LL |         if x == f64::INFINITY || x == f64::NEG_INFINITY {}
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the dedicated method instead: `x.is_infinite()`
+
+error: aborting due to 7 previous errors