Add some comments

Author: dswij

clippy_lints/src/methods/unnecessary_lazy_eval.rs

@@ -48,6 +48,9 @@ pub(super) fn check<'tcx>(
                     Applicability::MaybeIncorrect
                 };
 
+                // This is a duplicate of what's happening in clippy_lints::methods::method_call,
+                // which isn't ideal, We want to get the method call span,
+                // but prefer to avoid changing the signature of the function itself.
                 if let hir::ExprKind::MethodCall(_, _, span) = expr.kind {
                     span_lint_and_then(cx, UNNECESSARY_LAZY_EVALUATIONS, expr.span, msg, |diag| {
                         diag.span_suggestion(