Fix FP of manual_range_contains in const fn

clippy_lints/src/ranges.rs

@@ -13,8 +13,8 @@ use std::cmp::Ordering;
 
 use crate::utils::sugg::Sugg;
 use crate::utils::{
-    get_parent_expr, is_integer_const, single_segment_path, snippet, snippet_opt, snippet_with_applicability,
-    span_lint, span_lint_and_sugg, span_lint_and_then,
+    get_parent_expr, in_constant, is_integer_const, single_segment_path, snippet, snippet_opt,
+    snippet_with_applicability, span_lint, span_lint_and_sugg, span_lint_and_then,
 };
 use crate::utils::{higher, SpanlessEq};
 
@@ -175,7 +175,7 @@ impl<'tcx> LateLintPass<'tcx> for Ranges {
                 check_range_zip_with_len(cx, path, args, expr.span);
             },
             ExprKind::Binary(ref op, ref l, ref r) => {
-                check_possible_range_contains(cx, op.node, l, r, expr.span);
+                check_possible_range_contains(cx, op.node, l, r, expr);
             },
             _ => {},
         }
@@ -186,7 +186,12 @@ impl<'tcx> LateLintPass<'tcx> for Ranges {
     }
 }
 
-fn check_possible_range_contains(cx: &LateContext<'_>, op: BinOpKind, l: &Expr<'_>, r: &Expr<'_>, span: Span) {
+fn check_possible_range_contains(cx: &LateContext<'_>, op: BinOpKind, l: &Expr<'_>, r: &Expr<'_>, expr: &Expr<'_>) {
+    if in_constant(cx, expr.hir_id) {
+        return;
+    }
+
+    let span = expr.span;
     let combine_and = match op {
         BinOpKind::And | BinOpKind::BitAnd => true,
         BinOpKind::Or | BinOpKind::BitOr => false,

tests/ui/range_contains.fixed

@@ -44,3 +44,8 @@ fn main() {
     (0. ..1.).contains(&y);
     !(0. ..=1.).contains(&y);
 }
+
+// Fix #6373
+pub const fn in_range(a: i32) -> bool {
+    3 <= a && a <= 20
+}

tests/ui/range_contains.rs

@@ -44,3 +44,8 @@ fn main() {
     y >= 0. && y < 1.;
     y < 0. || y > 1.;
 }
+
+// Fix #6373
+pub const fn in_range(a: i32) -> bool {
+    3 <= a && a <= 20
+}