lean4-htt/tests/lean/run/apply4.lean

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open tactic bool
universe variables u
constant foo {A : Type u} [inhabited A] (a b : A) : a = default A → a = b
example (a b : nat) : a = 0 → a = b :=
by do
intro `H,
apply (expr.const `foo [level.of_nat 1]),
trace_state,
assumption
definition ex : inhabited (nat × nat × bool) :=
by apply_instance
set_option pp.all true
print ex
set_option pp.all false
example (a b : nat) : a = 0 → a = b :=
by do
intro `H,
apply_core semireducible tt ff (expr.const `foo [level.of_nat 1]),
trace_state,
a ← get_local `a,
trace_state,
mk_app `inhabited.mk [a] >>= exact,
trace "--------",
trace_state,
reflexivity
print "----------------"
set_option pp.all true
example (a b : nat) : a = 0 → a = b :=
by do
intro `H,
foo ← mk_const `foo,
trace foo,
apply foo,
trace_state,
assumption
example (a b : nat) : a = 0 → a = b :=
by do
`[intro],
apply_core semireducible tt ff (expr.const `foo [level.of_nat 1]),
`[exact inhabited.mk a],
reflexivity