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lean4-htt/tests/lean/run/subobject_from_source.lean
Sebastian Ullrich 009cff6f79 feat(frontends/lean/elaborator): prefer taking subobjects from structure notation sources as a whole 
This guarantees definitional equality on the field as witnessed by the test
2018-02-02 08:58:52 -08:00

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structure foo :=
(a b : ℕ := 2)
structure bar extends foo :=
(c : ℕ)
example (b : bar) : b.to_foo = {c := 2, ..b}.to_foo := rfl
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