7fa1a8b114
This PR eliminates uses of `intros x y z` (with arguments) and updates the `intros` docstring to suggest that `intro x y z` should be used instead. The `intros` tactic is historical, and can be traced all the way back to Lean 2, when `intro` could only introduce a single hypothesis. Since 2020, the `intro` tactic has superceded it. The `intros` tactic (without arguments) is currently still useful.
18 lines
251 B
Text
18 lines
251 B
Text
/--
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trace: case h
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d g : Nat
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H1 : d = g
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⊢ ?w = g
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case w
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d g : Nat
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H1 : d = g
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⊢ Nat
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-/
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#guard_msgs in
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example : ∀ d g, d = g → exists x : Nat, x = d := by
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intro d g H1
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constructor
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rewrite [H1,←H1,H1,←H1,H1]
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trace_state
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assumption
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