Avoid an integer underflow panic. Fixes #229.
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@ -1026,7 +1026,7 @@ fn rewrite_field(context: &RewriteContext,
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-> Option<String> {
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let name = &field.ident.node.to_string();
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let overhead = name.len() + 2;
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let expr = field.expr.rewrite(context, width - overhead, offset + overhead);
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let expr = field.expr.rewrite(context, try_opt!(width.checked_sub(overhead)), offset + overhead);
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expr.map(|s| format!("{}: {}", name, s))
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}
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