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Avoid an integer underflow panic. Fixes #229.

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This commit is contained in:
Josh Matthews 2015-08-30 23:15:14 -04:00
parent b59ab9c13f
commit 6cf74956b3
1 changed files with 1 additions and 1 deletions
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2
src/expr.rs
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@ -1026,7 +1026,7 @@ fn rewrite_field(context: &RewriteContext,
-> Option<String> { -> Option<String> {
let name = &field.ident.node.to_string(); let name = &field.ident.node.to_string();
let overhead = name.len() + 2; let overhead = name.len() + 2;
let expr = field.expr.rewrite(context, width - overhead, offset + overhead); let expr = field.expr.rewrite(context, try_opt!(width.checked_sub(overhead)), offset + overhead);
expr.map(|s| format!("{}: {}", name, s)) expr.map(|s| format!("{}: {}", name, s))
} }