Two problems
(1) the all cap `FEW' in the error message,
(2) after the error, x has the value 7.
(%i1) x;
(%o1) x
(%i2) lambda([x,y],x)(7);
Too FEW arguments supplied to lambda([x, y], x)(x, y):
[7]
#0: lambda([x,y],x)(x=7,)
#1: lambda([x,y],x)(x=7,)
-- an error. Quitting. To debug this try debugmode(true);
(%i3) x;
(%o3) 7
(%i4) build_info();
Maxima version: 5.9.1.1cvs
Maxima build date: 13:19 12/10/2004
host type: i686-pc-mingw32
lisp-implementation-type: Kyoto Common Lisp
lisp-implementation-version: GCL 2.6.5
Barton