Add comment about how we find the right span in non_fmt_panic.
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@ -71,6 +71,9 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
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// Find the span of the argument to `panic!()`, before expansion in the
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// case of `panic!(some_macro!())`.
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// We don't use source_callsite(), because this `panic!(..)` might itself
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// be expanded from another macro, in which case we want to stop at that
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// expansion.
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let mut arg_span = arg.span;
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let mut arg_macro = None;
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while !span.contains(arg_span) {
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