18 lines
564 B
Text
18 lines
564 B
Text
import Lean
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open Lean Lean.PrettyPrinter
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def foo : PUnit → PUnit := id
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def x : PUnit := ()
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@[appUnexpander foo] def unexpandFoo : Unexpander := fun _ => `(sorry)
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#eval do
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let e : Expr := mkApp (mkMData {} $ mkConst `foo [levelOne]) (mkConst `x)
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formatTerm (← delab e)
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#eval do
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let opts := ({}: Options).setBool `pp.universes true
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-- the MData annotation should make it not a regular application,
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-- so the unexpander should not be called.
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let e : Expr := mkApp (mkMData opts $ mkConst `foo [levelOne]) (mkConst `x)
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formatTerm (← delab e)
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