feat: 7125 shorten lint text

Author: christophbeberweil

clippy_lints/src/loops/single_element_loop.rs

@@ -88,12 +88,14 @@ pub(super) fn check<'tcx>(
         }
 
         if clippy_utils::higher::Range::hir(arg_expression).is_some() {
+            let range_expr = snippet(cx, arg_expression.span, "?").to_string();
+
             let sugg = snippet(cx, arg_expression.span, "..");
             span_lint_and_sugg(
                 cx,
                 SINGLE_ELEMENT_LOOP,
                 arg.span,
-                "for loop over a single range inside an array, rather than iterating over the elements in the range directly",
+                format!("This loops only once with {pat_snip} being {range_expr}").as_str(),
                 "did you mean to iterate over the range instead?",
                 sugg.to_string(),
                 Applicability::Unspecified,

tests/ui/single_element_loop.stderr

@@ -32,25 +32,25 @@ LL +         dbg!(item);
 LL +     }
    |
 
-error: for loop over a single range inside an array, rather than iterating over the elements in the range directly
+error: This loops only once with item being 0..5
   --> $DIR/single_element_loop.rs:16:17
    |
 LL |     for item in &[0..5] {
    |                 ^^^^^^^ help: did you mean to iterate over the range instead?: `0..5`
 
-error: for loop over a single range inside an array, rather than iterating over the elements in the range directly
+error: This loops only once with item being 0..5
   --> $DIR/single_element_loop.rs:20:17
    |
 LL |     for item in [0..5].iter_mut() {
    |                 ^^^^^^^^^^^^^^^^^ help: did you mean to iterate over the range instead?: `0..5`
 
-error: for loop over a single range inside an array, rather than iterating over the elements in the range directly
+error: This loops only once with item being 0..5
   --> $DIR/single_element_loop.rs:24:17
    |
 LL |     for item in [0..5] {
    |                 ^^^^^^ help: did you mean to iterate over the range instead?: `0..5`
 
-error: for loop over a single range inside an array, rather than iterating over the elements in the range directly
+error: This loops only once with item being 0..5
   --> $DIR/single_element_loop.rs:28:17
    |
 LL |     for item in [0..5].into_iter() {