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In a Meta := Evar unification problem and the Meta is bound to a
(named) binder, and the Evar is a GoalEvar, we set the source of the
evar to be the one of the Meta.
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This gives IMO slightly nicer errors when the type cannot be inferred,
ie
~~~coq
Type (forall x, x = x).
~~~
says "cannot infer the implicit parameter A of eq" instead of "cannot
infer this placeholder".
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Add experimental "Show Proof" command to the toplevel that shadows
the current command in the parser (in coqtop and PG only).
Apply existing code to highlight diffs in the output
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It prints a goal given its internal goal id and the Stm state id.
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