3f2cf8bf27
Before, `pp.instantiateMVars` generally had no effect because most call sites for the pretty printer instantiated metavariables first, but now this functionality is entrusted upon the `pp.instantiateMVars` option. This also has an effect in hovers, where metavariables can be unfolded one assignment at a time. However, the goal state still sees all metavariables instantiated due to the fact that the algorithm relies on expression equality post-instantiation (see `Lean.Widget.goalToInteractive`). Closes #4406
24 lines
501 B
Text
24 lines
501 B
Text
import Lean.Elab.Command
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/-!
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# Issue 4406: make sure `pp.instantiateMVars` has an effect
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-/
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open Lean Meta
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set_option pp.mvars false
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/-- info: ?_ -/
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#guard_msgs in
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set_option pp.instantiateMVars false in
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run_meta do
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let mvarId ← mkFreshExprMVar (.some (.const ``Nat []))
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mvarId.mvarId!.assign (mkNatLit 0)
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logInfo m!"{mvarId}"
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/-- info: 0 -/
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#guard_msgs in
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run_meta do
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let mvarId ← mkFreshExprMVar (.some (.const ``Nat []))
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mvarId.mvarId!.assign (mkNatLit 0)
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logInfo m!"{mvarId}"
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