14 lines
362 B
Text
14 lines
362 B
Text
import Lean.Meta.Tactic.Simp.Simproc
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import Lean.Meta.Offset
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def foo (x : Nat) : Nat :=
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x + 10
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simproc reduce_foo (foo _) := fun e => open Lean Meta in do
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let some n ← evalNat e.appArg! |>.run | return none
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return some (.done { expr := mkNatLit (n+10) })
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set_option tactic.simp.trace true
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example : x + foo 2 = 12 + x := by
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simp
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rw [Nat.add_comm]
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