bug#24318: char<=? with three args

[Helmut Eller]

Compiling a file x.scm:

  (library (x)
    (export)
    (import (rnrs))
    (define (foo x) (char<=? #\0 x #\9)))

causes an error:

 shell> guile --version | head -n1
 guile (GNU Guile) 2.1.3.104-8f2f8
 shell> guile -c '(compile-file "x.scm")'
Backtrace:    
In system/base/compile.scm:
    152:6 19 (compile-file _ #:output-file _ #:from _ #:to _ #:env _ …)
     43:4 18 (call-once _)
In ice-9/boot-9.scm:
    829:4 17 (with-throw-handler _ _ _)
In system/base/compile.scm:
    59:11 16 (_)
   155:11 15 (_ #<closed: file 9fbf930>)
   224:14 14 (read-and-compile _ #:from _ #:to _ #:env _ #:opts _)
    255:6 13 (compile _ #:from _ #:to _ #:env _ #:opts _)
   183:32 12 (compile-fold _ #<tree-il (seq (let (m) (m-121) ((call…> …)
In language/cps/compile-bytecode.scm:
   573:12 11 (compile-bytecode #<intmap 0-257> #<directory (x) a138…> …)
   566:12 10 (lower-cps _ (#:to-file? #t))
In language/cps/optimize.scm:
     86:0  9 (optimize-higher-order-cps _ _)
In language/cps/dce.scm:
   357:33  8 (eliminate-dead-code _)
   105:18  7 (compute-live-code #<intmap 0-222>)
In language/cps/intmap.scm:
    514:5  6 (visit-branch #(#(#<cps (kfun () 0 139 1)> #<cps…> …) …) …)
    514:5  5 (visit-branch #(#<cps (kargs (rest) (195) (continue…> …) …)
In language/cps/type-checks.scm:
     47:5  4 (elide-type-checks #<intmap 0-222> _ _)
In language/cps/intmap.scm:
    514:5  3 (visit-branch #((absent) (absent) (absent) (absent) # …) …)
In language/cps/type-checks.scm:
    43:10  2 (_ 221 _ #<intmap 0-222>)
In language/cps/types.scm:
   1420:0  1 (_ _ _ _)
In ice-9/boot-9.scm:
   753:26  0 (dispatch-exception _ _ _)

ice-9/boot-9.scm:753:26: In procedure dispatch-exception:
ice-9/boot-9.scm:753:26: Wrong number of arguments to #<procedure b5eac480 at 
language/cps/types.scm:1420:0 (typeset t-41149 t-41150)>
[Exit 1]