6 lines
191 B
Text
6 lines
191 B
Text
set_option new_elaborator true
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universe variable u
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variable {A : Type u}
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lemma foo (f : A → A → A) (a b c : A) (H₁ : a = b) (H₂ : c = b) : f a = f c :=
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H₂ ▸ eq.symm H₁ ▸ rfl
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