7557542bc2
This PR modifies the `structure` syntax so that parents can be named, like in ```lean structure S extends toParent : P ``` **Breaking change:** The syntax is also modified so that the resultant type comes *before* the `extends` clause, for example `structure S : Prop extends P`. This is necessary to prevent a parsing ambiguity, but also this is the natural place for the resultant type. Implements RFC #7099. Will need followup PRs for cleanup after a stage0 update. |
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