da2b91558e
This PR adds line breaks and indentations to simp's trace messages to make them easier to read (IMHO).
20 lines
643 B
Text
20 lines
643 B
Text
variable {α : Type _} [Mul α] [Inhabited α]
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abbrev Left (a : α) : α := a * default
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abbrev Right (a : α): α := default * a
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theorem mul_comm (a b : α) : a * b = b * a := sorry
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set_option trace.Meta.Tactic.simp true
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/--
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info: [Meta.Tactic.simp.rewrite] mul_comm:1000:perm, perm rejected Left a ==> default * a
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[Meta.Tactic.simp.rewrite] mul_comm:1000:perm:
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Right a
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==>
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a * default
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[Meta.Tactic.simp.rewrite] mul_comm:1000:perm, perm rejected a * default ==> default * a
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[Meta.Tactic.simp.rewrite] eq_self:1000: Left a = a * default ==> True
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-/
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#guard_msgs in
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example (a : α) : Left a = Right a := by
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simp [mul_comm]
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