0e49576fe4
This PR makes `#guard_msgs` to treat `trace` messages separate from `info`, `warning` and `error`. It also introduce the ability to say `#guard_msgs (pass info`, like `(drop info)` so far, and also adds `(check info)` as the explicit form of `(info)`, for completeness. Fixes #8266
70 lines
1.3 KiB
Text
70 lines
1.3 KiB
Text
import Lean
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open Lean
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open Lean.Elab
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open Lean.Meta
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open Lean.Elab.Tactic
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/--
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trace: a b c : Nat
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h₁ : a = b
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h₂ : b = c
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⊢ a = b
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-/
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#guard_msgs in
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example (a b c : Nat) (h₁ : a = b) (h₂ : b = c) : a = c := by
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apply Eq.trans _ h₂ -- the metavars created during elaboration become new goals
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trace_state
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exact h₁
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/--
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trace: case h
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a : Nat
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⊢ ?w = a
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case w
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a : Nat
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⊢ Nat
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-/
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#guard_msgs in
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example (a : Nat) : ∃ x, x = a := by
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apply Exists.intro -- the goal for the witness should occur "after" the goal for x = a
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trace_state
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rfl
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elab "fapply " e:term : tactic =>
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evalApplyLikeTactic (MVarId.apply (cfg := {newGoals := ApplyNewGoals.all})) e
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elab "eapply " e:term : tactic =>
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evalApplyLikeTactic (MVarId.apply (cfg := {newGoals := ApplyNewGoals.nonDependentOnly})) e
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/--
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trace: case h
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a : Nat
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⊢ ?w = a
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-/
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#guard_msgs in
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example (a : Nat) : ∃ x, x = a := by
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eapply Exists.intro -- only metavars with out forward dependencies are added as goals.
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trace_state
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rfl
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/--
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trace: case w
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a : Nat
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⊢ Nat
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case h
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a : Nat
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⊢ ?w = a
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---
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trace: case h
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a : Nat
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⊢ a = a
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-/
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#guard_msgs in
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example (a : Nat) : ∃ x, x = a := by
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fapply Exists.intro -- all unassigned metavars are added as new goals using the order they were created.
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trace_state
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exact a
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trace_state
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rfl
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