34 lines
978 B
Text
34 lines
978 B
Text
import Lean.Meta.Tactic.Simp.BuiltinSimprocs
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def foo (x : Nat) : Nat :=
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x + 10
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open Lean Meta
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/-- doc-comment for reduceFoo -/
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simproc reduceFoo (foo _) := fun e => do
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unless e.isAppOfArity ``foo 1 do return .continue
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let some n ← Nat.fromExpr? e.appArg! | return .continue
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return .done { expr := mkNatLit (n+10) }
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#eval show MetaM _ from do
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guard <| (← findDocString? (← getEnv) ``reduceFoo) = some "doc-comment for reduceFoo "
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example : x + foo 2 = 12 + x := by
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set_option simprocs false in fail_if_success simp
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simp_arith
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example : x + foo 2 = 12 + x := by
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-- `simp only` must not use the default simproc set
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fail_if_success simp only
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simp_arith
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example : x + foo 2 = 12 + x := by
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-- `simp only` does not use the default simproc set, but we can provide simprocs as arguments
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simp only [reduceFoo]
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simp_arith
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example : x + foo 2 = 12 + x := by
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-- We can use `-` to disable `simproc`s
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fail_if_success simp [-reduce_foo]
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simp_arith
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