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Automatically merged updates to draft EIP(s) 1155 (#2120) 

Hi, I'm a bot! This change was automatically merged because:

 - It only modifies existing Draft or Last Call EIP(s)
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Andrew Cooke 2019-06-14 19:37:43 -04:00 committed by EIP Automerge Bot
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EIPS/eip-1155.md
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@ -424,6 +424,7 @@ If the optional `ERC1155Metadata_URI` extension is included:
- An implementation MAY emit the `URI` event during a mint operation but it is NOT mandatory. An observer MAY fetch the metadata uri at mint time from the `uri` function if it was not emitted.
* The `uri` function SHOULD be used to retrieve values if no event was emitted.
* The `uri` function MUST return the same value as the latest event for an `_id` if it was emitted.
* The `uri` function MUST NOT be used to check for the existence of a token as it is possible for an implementation to return a valid string even if the token does not exist.
```solidity
pragma solidity ^0.5.9;