fix: single_range_in_vec_init FP for explicit Range

Author: profetia

clippy_lints/src/single_range_in_vec_init.rs

@@ -9,6 +9,7 @@ use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, LangItem, StructTailExpr};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
+use rustc_span::DesugaringKind;
 use std::fmt::{self, Display, Formatter};
 
 declare_clippy_lint! {
@@ -91,6 +92,7 @@ impl LateLintPass<'_> for SingleRangeInVecInit {
         };
 
         if cx.tcx.qpath_is_lang_item(qpath, LangItem::Range)
+            && inner_expr.span.is_desugaring(DesugaringKind::RangeExpr)
             && let ty = cx.typeck_results().expr_ty(start.expr)
             && let Some(snippet) = span.get_source_text(cx)
             // `is_from_proc_macro` will skip any `vec![]`. Let's not!

tests/ui/single_range_in_vec_init.rs

@@ -66,3 +66,9 @@ fn main() {
         vec![0..200];
     }
 }
+
+fn issue16042() {
+    use std::ops::Range;
+
+    let input = vec![Range { start: 0, end: 5 }];
+}