{{[a]a,x,y}}[1][2][3]

[tavmem]

In k3.2:
K 3.2 2005-06-25 Copyright (C) 1993-2004 Kx Systems
{{[a]a,x,y}}[1][2][3]
index error

in Kona:
{{[a]a,x,y}}[1][2][3]
index error

however, both k3.2 and Kona should yield
3 1 2

[tavmem]

The current state of the systems:
In k3.2:
f:{{[a]a,x}}123
f
{[a]a,x}

g:{{[a]a,x,y}}[123]456
g
456 123 456

In Kona:
f:{{[a]a,x}}123
{[a]a,x}

g:{{[a]a,x,y}}[123]456
(456;123;)

In each system, g should be a brace function within which
x is bound to 123 y is bound to 456

and, of course,
g 789
should yield
789 123 456

[tavmem]

The last message had an error (which was corrected on github.com):
in k3.2:
g:{{[a]a,x,y}}[123]456
g
456 123 456

[tavmem]

See comments in issue #427