lean4-htt/tests/lean/defeq1.lean
Sebastian Ullrich fd2c42a8bf chore(library, tests): switch to new attribute declaration syntax
sed -Ei 's/^(\s*)((private |protected )?(noncomputable )?(abbreviation|definition|meta_definition|theorem|lemma|proposition|corollary)\s+\S+\s*)((\s*\[(\S+(\s+[0-9]+)*|priority.*)\])+)\s*/\1attribute \6\n\1\2/' library/**/*.lean tests/**/*.lean
sed -Ei 's/\s+$//' library/**/*.lean  # remove trailing whitespace
2016-08-12 15:36:12 -07:00

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open nat tactic
variables {A : Type}
attribute [defeq]
definition succ_eq_add (n : nat) : succ n = n + 1 :=
rfl
example (n m : nat) (H : succ (succ n) = succ m) : true :=
by do H ← get_local `H,
t ← infer_type H,
t' ← defeq_simp t,
trace t',
exact (expr.const `trivial [])