18 lines
445 B
Text
18 lines
445 B
Text
new_frontend
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def A.foo {α : Type} [HasAdd α] (a : α) : α × α :=
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(a, a + a)
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def B.foo {α : Type} (a : α) : α × α :=
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(a, a)
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open A
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open B
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set_option trace.Meta.synthInstance true
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-- `foo` is overloaded, the case `A.foo` is discarded because we don't have an instance `[HasAdd String]`.
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-- However, we still want to see the trace since we used trace.Meta.synthInstance
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#check foo "hello"
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theorem ex : foo true = (true, true) :=
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rfl
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