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feat: fix some issues with equals t => tac #1291

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feat: fix some issues with equals t => tac #1291

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9f78985
fix
plp127 Jun 26, 2025
e93fc54
ensure goal is solved
plp127 Jun 26, 2025
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11 changes: 9 additions & 2 deletions Batteries/Tactic/Init.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -98,5 +98,12 @@ example (P : (Nat → Nat) → Prop) : P (fun n => n - n) := by
-- current goal: P (fun n => 0)
```
-/
macro (name := Conv.equals) "equals " t:term " => " tac:tacticSeq : conv =>
`(conv| tactic => show (_ = $t); next => $tac)
elab (name := Conv.equals) "equals " t:term " => " tac:tacticSeq : conv => do
let mvarId ← getMainGoal
mvarId.withContext do
let goal ← mvarId.getType
let some (α, _, rhs) ← matchEq? goal | throwError "invalid 'conv' goal"
let e ← Term.withSynthesize do
Tactic.elabTermEnsuringType t (some α)
unless ← isDefEq rhs e do throwError m!"failed to resolve{indentExpr rhs}\n=?={indentExpr e}"
evalTactic <| ← `(conv| tactic => · $tac)