lean4-htt/tests/lean/vm_let_expr.lean
Leonardo de Moura 6e7929252f feat(frontends/lean, library/init): add 'thunk' gadget
We can now write
   trace "hello" t
instead of
   trace "hello" (fun _, t)
2017-01-31 18:41:59 -08:00

11 lines
243 B
Text

meta def mk_value (n : nat) : nat :=
trace "mk_value" (2 * n)
meta def mk_fn (sz : nat) : nat → nat :=
let n := mk_value sz in
λ x, x + n
vm_eval let f := mk_fn 10 in f 1 + f 2 + f 3 + f 4
vm_eval ((let x := mk_value 10 in mk_fn x) 10)