[useless_conversion]: fix FP in macro and add test

Author: y21

clippy_lints/src/useless_conversion.rs

@@ -102,6 +102,17 @@ fn into_iter_deep_call<'hir>(cx: &LateContext<'_>, mut expr: &'hir Expr<'hir>) -
     (expr, depth)
 }
 
+/// Checks if the given `expr` is an argument of a macro invocation.
+/// This is a slow-ish operation, so consider calling this late
+/// to avoid slowing down the lint in the happy path when not emitting a warning
+fn is_macro_argument(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+    if let Some(parent) = get_parent_expr(cx, expr) {
+        parent.span.from_expansion() || is_macro_argument(cx, parent)
+    } else {
+        false
+    }
+}
+
 #[expect(clippy::too_many_lines)]
 impl<'tcx> LateLintPass<'tcx> for UselessConversion {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
@@ -174,6 +185,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
                             && let Some(&into_iter_param) = sig.inputs().get(kind.param_pos(arg_pos))
                             && let ty::Param(param) = into_iter_param.kind()
                             && let Some(span) = into_iter_bound(cx, parent_fn_did, into_iter_did, param.index)
+                            && !is_macro_argument(cx, e)
                         {
                             // Get the "innermost" `.into_iter()` call, e.g. given this expression:
                             // `foo.into_iter().into_iter()`

tests/ui/crashes/ice-11065.rs

@@ -0,0 +1,19 @@
+#![warn(clippy::useless_conversion)]
+
+use std::iter::FromIterator;
+use std::option::IntoIter as OptionIter;
+
+fn eq<T: Eq>(a: T, b: T) -> bool {
+    a == b
+}
+
+macro_rules! tests {
+    ($($expr:expr, $ty:ty, ($($test:expr),*);)+) => (pub fn main() {$({
+        const C: $ty = $expr;
+        assert!(eq(C($($test),*), $expr($($test),*)));
+    })+})
+}
+
+tests! {
+    FromIterator::from_iter, fn(OptionIter<i32>) -> Vec<i32>, (Some(5).into_iter());
+}