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() {