Prevent lint from trigger on proc-macro expanded code

Co-authored-by: Alejandra González <[email protected]>

Author: declanvk

clippy_lints/src/duration_to_float_precision_loss.rs

@@ -212,7 +212,7 @@ fn check_cast<'tcx>(
     expr: &'tcx Expr<'_>,
     duration_expr: &'tcx Expr<'_>,
 ) -> Option<LintApplicableSite> {
-    if let ExprKind::MethodCall(method_path, method_receiver_expr, [], _) = duration_expr.kind {
+    if let ExprKind::MethodCall(method_path, method_receiver_expr, [], _) = duration_expr.kind && !is_from_proc_macro!(cx, expr) {
         let method_receiver_ty = cx.typeck_results().expr_ty(method_receiver_expr);
         if is_type_diagnostic_item(cx, method_receiver_ty.peel_refs(), sym::Duration) {
             let cast_expr_ty = cx.typeck_results().expr_ty(expr);