ec565f3bf7
This PR fixes `pp.fvars.anonymous` to display loose free variables as `_fvar._` instead of `_` when the option is set to `false`. This was the intended behavior in https://github.com/leanprover/lean4/pull/12688 but the fix was committed locally and not pushed before that PR was merged. 🤖 Prepared with Claude Code Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
27 lines
782 B
Text
27 lines
782 B
Text
import Lean
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/-!
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# Tests for `pp.fvars.anonymous`
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When a free variable is not in the local context (a "loose" fvar),
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the pretty printer renders it with an internal name like `_fvar.42`.
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The `pp.fvars.anonymous` option (default `true`) controls this behavior:
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when set to `false`, loose fvars are displayed as `_fvar._`.
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-/
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open Lean Elab Command in
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#guard_msgs in
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run_cmd liftTermElabM do
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let fvarId : FVarId := { name := .num `_uniq 42 }
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let e := Expr.fvar fvarId
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let fmt ← Meta.ppExpr e
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guard <| s!"{fmt}" == "_fvar.42"
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set_option pp.fvars.anonymous false in
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open Lean Elab Command in
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#guard_msgs in
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run_cmd liftTermElabM do
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let fvarId : FVarId := { name := .num `_uniq 42 }
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let e := Expr.fvar fvarId
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let fmt ← Meta.ppExpr e
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guard <| s!"{fmt}" == "_fvar._"
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