MSRV and more specific message

Author: pitaj

clippy_lints/src/methods/is_digit_ascii_radix.rs

@@ -18,10 +18,10 @@ pub(super) fn check<'tcx>(
         return;
     }
 
-    if let Some(radix) = constant_full_int(cx, cx.typeck_results(), radix) {
-        let replacement = match radix {
-            FullInt::S(10) | FullInt::U(10) => "is_ascii_digit",
-            FullInt::S(16) | FullInt::U(16) => "is_ascii_hexdigit",
+    if let Some(radix_val) = constant_full_int(cx, cx.typeck_results(), radix) {
+        let (num, replacement) = match radix_val {
+            FullInt::S(10) | FullInt::U(10) => (10, "is_ascii_digit"),
+            FullInt::S(16) | FullInt::U(16) => (16, "is_ascii_hexdigit"),
             _ => return,
         };
         let mut applicability = Applicability::MachineApplicable;
@@ -30,7 +30,7 @@ pub(super) fn check<'tcx>(
             cx,
             IS_DIGIT_ASCII_RADIX,
             expr.span,
-            "use of `char::is_digit(..)` with literal radix of 10 or 16",
+            &format!("use of `char::is_digit` with literal radix of {}", num),
             "try",
             format!(
                 "{}.{}()",

clippy_lints/src/methods/mod.rs

@@ -2490,7 +2490,9 @@ fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Optio
             },
             ("get_or_insert_with", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "get_or_insert"),
             ("is_file", []) => filetype_is_file::check(cx, expr, recv),
-            ("is_digit", [radix]) => is_digit_ascii_radix::check(cx, expr, recv, radix),
+            ("is_digit", [radix]) if meets_msrv(msrv, &msrvs::IS_ASCII_DIGIT) => {
+                is_digit_ascii_radix::check(cx, expr, recv, radix);
+            },
             ("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
             ("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
             ("join", [join_arg]) => {

clippy_utils/src/msrvs.rs

@@ -32,4 +32,5 @@ msrv_aliases! {
     1,28,0 { FROM_BOOL }
     1,17,0 { FIELD_INIT_SHORTHAND, STATIC_IN_CONST }
     1,16,0 { STR_REPEAT }
+    1,24,0 { IS_ASCII_DIGIT }
 }

tests/ui/is_digit_ascii_radix.stderr

@@ -1,18 +1,18 @@
-error: use of `char::is_digit(..)` with literal radix of 10 or 16
+error: use of `char::is_digit` with literal radix of 10
   --> $DIR/is_digit_ascii_radix.rs:11:13
    |
 LL |     let _ = c.is_digit(10);
    |             ^^^^^^^^^^^^^^ help: try: `c.is_ascii_digit()`
    |
    = note: `-D clippy::is-digit-ascii-radix` implied by `-D warnings`
 
-error: use of `char::is_digit(..)` with literal radix of 10 or 16
+error: use of `char::is_digit` with literal radix of 16
   --> $DIR/is_digit_ascii_radix.rs:12:13
    |
 LL |     let _ = c.is_digit(16);
    |             ^^^^^^^^^^^^^^ help: try: `c.is_ascii_hexdigit()`
 
-error: use of `char::is_digit(..)` with literal radix of 10 or 16
+error: use of `char::is_digit` with literal radix of 16
   --> $DIR/is_digit_ascii_radix.rs:13:13
    |
 LL |     let _ = c.is_digit(0x10);