lean2/tests/lean/induct.lean

import macros
import tactic
using Nat

theorem add_comm2 (a b : Nat) : a + b = b + a
:= induction_on b (by skip) _
fix(library/elaborator): try first projection before imitation in the higher-order unifier Projections build more general solutions. This commit also adds a test that demonstrates the issue. Before this commit, the elaborator would produce the "constant" predicate (fun x, a + b = b + a). Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2014-02-06 21:35:00 +00:00			`import macros`
			`import tactic`
			`using Nat`

			`theorem add_comm2 (a b : Nat) : a + b = b + a`
			`:= induction_on b (by skip) _`