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Print bad indexes in iterutil test

    Easier for debugging.

--- a/lib/std/test/iterutil.myr

+++ b/lib/std/test/iterutil.myr

@@ -5,15 +5,15 @@

 	n = 0

 	for (x, i) in std.byenum([0,2,4,6,8][:])

-		std.assert(x == n, "invalid enum idx")

-		std.assert(i == n*2, "invalid enum val")

+		std.assert(x == n, "invalid enum idx {}", x)

+		std.assert(i == n*2, "invalid enum val {}", i)

 		n++

 	;;

 	n = 0

 	for (a, b) in std.byzip([0,2,4,6,8][:], [2,4][:])

-		std.assert(a == n*2, "invalid val from a")

-		std.assert(b == n*2 + 2, "invalid val from b")

+		std.assert(a == n*2, "invalid val from a: {}", a)

+		std.assert(b == n*2 + 2, "invalid val from b: {}", b)

 		n++

 	;;

 }