Fix #131471, range misleading field access

Fixes #131471 by checking if the range-start is a literal.

compiler/rustc_resolve/src/late.rs

@@ -4011,6 +4011,7 @@ fn smart_resolve_path_fragment(
                 let instead = res.is_some();
                 let suggestion = if let Some((start, end)) = this.diag_metadata.in_range
                     && path[0].ident.span.lo() == end.span.lo()
+                    && !matches!(start.kind, ExprKind::Lit(_))
                 {
                     let mut sugg = ".";
                     let mut span = start.span.between(end.span);

tests/ui/range/misleading-field-access-hint.rs

@@ -0,0 +1,8 @@
+// Check if rustc still displays the misleading hint to write `.` instead of `..`
+fn main() {
+    let width = 10;
+    // ...
+    for _ in 0..w {
+        //~^ ERROR cannot find value `w`
+    }
+}

tests/ui/range/misleading-field-access-hint.stderr

@@ -0,0 +1,9 @@
+error[E0425]: cannot find value `w` in this scope
+  --> $DIR/misleading-field-access-hint.rs:5:17
+   |
+LL |     for _ in 0..w {
+   |                 ^ not found in this scope
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0425`.