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Block 0 is valid in queries #8891

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Jun 14, 2018
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Block 0 is valid in queries #8891

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3 changes: 2 additions & 1 deletion ethcore/src/client/client.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1047,7 +1047,8 @@ impl Client {
/// Otherwise, this can fail (but may not) if the DB prunes state.
pub fn state_at_beginning(&self, id: BlockId) -> Option<State<StateDB>> {
match self.block_number(id) {
None | Some(0) => None,
None => None,
Some(0) => self.state_at(id),
Some(n) => self.state_at(BlockId::Number(n - 1)),
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any idea why is it n - 1 ?

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I think it's the state at the beginning of the block, i.e. last block's end state.

}
}
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