35 lines
656 B
Text
35 lines
656 B
Text
import Lean
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open Lean.Elab.Term
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open Lean.Elab.Command
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elab "∃'" b:term "," P:term : term => do
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let ex ← `(Exists (fun $b => $P));
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elabTerm ex none
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elab "#check2" b:term : command => do
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let cmd ← `(#check $b #check $b);
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elabCommand cmd
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#check ∃' x, x > 0
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#check ∃' (x : UInt32), x > 0
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#check2 10
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elab "try" t:tactic : tactic => do
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let t' ← `(tactic| first | $t | skip);
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Lean.Elab.Tactic.evalTactic t'
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theorem tst (x y z : Nat) : y = z → x = x → x = y → x = z :=
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by {
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intro h1; intro h2; intro h3;
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apply @Eq.trans;
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try exact h1; -- `exact h1` fails
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trace_state;
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try exact h3;
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trace_state;
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try exact h1;
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}
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